Merge pull request #525 from MoonchildProductions/newtab-page-work

Newtab page work

14 files changed, 1099 insertions, 329 deletions

diff --git a/application/palemoon/base/content/browser.js b/application/palemoon/base/content/browser.js
index 6df6488b1..386bd418b 100644
--- a/application/palemoon/base/content/browser.js
+++ b/application/palemoon/base/content/browser.js
@@ -2400,6 +2400,9 @@ function PageProxyClickHandler(aEvent)
  *  to the DOM for unprivileged pages.
  */
 function BrowserOnAboutPageLoad(doc) {
+
+  /* === about:home === */
+
   if (doc.documentURI.toLowerCase() == "about:home") {
     let ss = Components.classes["@mozilla.org/browser/sessionstore;1"].
              getService(Components.interfaces.nsISessionStore);
@@ -2438,6 +2441,32 @@ function BrowserOnAboutPageLoad(doc) {
       Services.obs.removeObserver(updateSearchEngine, "browser-search-engine-modified");
     }, false);
   }
+
+  /* === about:newtab === */
+  
+  if (doc.documentURI.toLowerCase() == "about:newtab") {
+
+    let docElt = doc.documentElement;
+
+    function updateSearchEngine() {
+      let engine = AboutHomeUtils.defaultSearchEngine;
+      docElt.setAttribute("searchEngineName", engine.name);
+      docElt.setAttribute("searchEnginePostData", engine.postDataString || "");
+      docElt.setAttribute("searchEngineURL", engine.searchURL);
+    }
+    updateSearchEngine();
+
+    // Listen for the event that's triggered when the user changes search engine.
+    // At this point we simply reload about:newtab to reflect the change.
+    Services.obs.addObserver(updateSearchEngine, "browser-search-engine-modified", false);
+
+    // Remove the observer when the page is reloaded or closed.
+    doc.defaultView.addEventListener("pagehide", function removeObserver() {
+      doc.defaultView.removeEventListener("pagehide", removeObserver);
+      Services.obs.removeObserver(updateSearchEngine, "browser-search-engine-modified");
+    }, false);
+  }
+
 }
 
 /**
diff --git a/application/palemoon/base/content/newtab/drag.js b/application/palemoon/base/content/newtab/drag.js
index fbd688faa..e3928ebd0 100644
--- a/application/palemoon/base/content/newtab/drag.js
+++ b/application/palemoon/base/content/newtab/drag.js
@@ -140,7 +140,7 @@ var gDrag = {
     // drag image with its default opacity.
     let dragElement = document.createElementNS(HTML_NAMESPACE, "div");
     dragElement.classList.add("newtab-drag");
-    let scrollbox = document.getElementById("newtab-scrollbox");
+    let scrollbox = document.getElementById("newtab-vertical-margin");
     scrollbox.appendChild(dragElement);
     dt.setDragImage(dragElement, 0, 0);
 
diff --git a/application/palemoon/base/content/newtab/dragDataHelper.js b/application/palemoon/base/content/newtab/dragDataHelper.js
index 54348ab14..675ff2671 100644
--- a/application/palemoon/base/content/newtab/dragDataHelper.js
+++ b/application/palemoon/base/content/newtab/dragDataHelper.js
@@ -11,7 +11,7 @@ var gDragDataHelper = {
 
   getLinkFromDragEvent: function DragDataHelper_getLinkFromDragEvent(aEvent) {
     let dt = aEvent.dataTransfer;
-    if (!dt || !dt.types.contains(this.mimeType)) {
+    if (!dt || !dt.types.includes(this.mimeType)) {
       return null;
     }
 
diff --git a/application/palemoon/base/content/newtab/dropTargetShim.js b/application/palemoon/base/content/newtab/dropTargetShim.js
index 046dbea1e..57a97fa00 100644
--- a/application/palemoon/base/content/newtab/dropTargetShim.js
+++ b/application/palemoon/base/content/newtab/dropTargetShim.js
@@ -23,27 +23,53 @@ var gDropTargetShim = {
   /**
    * Initializes the drop target shim.
    */
-  init: function DropTargetShim_init() {
-    let node = gGrid.node;
+  init: function () {
+    gGrid.node.addEventListener("dragstart", this, true);
+  },
+
+  /**
+   * Add all event listeners needed during a drag operation.
+   */
+  _addEventListeners: function () {
+    gGrid.node.addEventListener("dragend", this);
 
-    // Add drag event handlers.
-    node.addEventListener("dragstart", this, true);
-    node.addEventListener("dragend", this, true);
+    let docElement = document.documentElement;
+    docElement.addEventListener("dragover", this);
+    docElement.addEventListener("dragenter", this);
+    docElement.addEventListener("drop", this);
+  },
+
+  /**
+   * Remove all event listeners that were needed during a drag operation.
+   */
+  _removeEventListeners: function () {
+    gGrid.node.removeEventListener("dragend", this);
+
+    let docElement = document.documentElement;
+    docElement.removeEventListener("dragover", this);
+    docElement.removeEventListener("dragenter", this);
+    docElement.removeEventListener("drop", this);
   },
 
   /**
    * Handles all shim events.
    */
-  handleEvent: function DropTargetShim_handleEvent(aEvent) {
+  handleEvent: function (aEvent) {
     switch (aEvent.type) {
       case "dragstart":
-        this._start(aEvent);
+        this._dragstart(aEvent);
+        break;
+      case "dragenter":
+        aEvent.preventDefault();
         break;
       case "dragover":
         this._dragover(aEvent);
         break;
+      case "drop":
+        this._drop(aEvent);
+        break;
       case "dragend":
-        this._end(aEvent);
+        this._dragend(aEvent);
         break;
     }
   },
@@ -52,69 +78,63 @@ var gDropTargetShim = {
    * Handles the 'dragstart' event.
    * @param aEvent The 'dragstart' event.
    */
-  _start: function DropTargetShim_start(aEvent) {
+  _dragstart: function (aEvent) {
     if (aEvent.target.classList.contains("newtab-link")) {
       gGrid.lock();
-
-      // XXX bug 505521 - Listen for dragover on the document.
-      document.documentElement.addEventListener("dragover", this, false);
+      this._addEventListeners();
     }
   },
 
   /**
-   * Handles the 'drag' event and determines the current drop target.
-   * @param aEvent The 'drag' event.
+   * Handles the 'dragover' event.
+   * @param aEvent The 'dragover' event.
    */
-  _drag: function DropTargetShim_drag(aEvent) {
-    // Let's see if we find a drop target.
-    let target = this._findDropTarget(aEvent);
-
-    if (target != this._lastDropTarget) {
-      if (this._lastDropTarget)
-        // We left the last drop target.
-        this._dispatchEvent(aEvent, "dragexit", this._lastDropTarget);
-
-      if (target)
-        // We're now hovering a (new) drop target.
-        this._dispatchEvent(aEvent, "dragenter", target);
+  _dragover: function (aEvent) {
+    // XXX bug 505521 - Use the dragover event to retrieve the
+    //                  current mouse coordinates while dragging.
+    let sourceNode = aEvent.dataTransfer.mozSourceNode.parentNode;
+    gDrag.drag(sourceNode._newtabSite, aEvent);
 
-      if (this._lastDropTarget)
-        // We left the last drop target.
-        this._dispatchEvent(aEvent, "dragleave", this._lastDropTarget);
+    // Find the current drop target, if there's one.
+    this._updateDropTarget(aEvent);
 
-      this._lastDropTarget = target;
+    // If we have a valid drop target,
+    // let the drag-and-drop service know.
+    if (this._lastDropTarget) {
+      aEvent.preventDefault();
     }
   },
 
   /**
-   * Handles the 'dragover' event as long as bug 505521 isn't fixed to get
-   * current mouse cursor coordinates while dragging.
-   * @param aEvent The 'dragover' event.
+   * Handles the 'drop' event.
+   * @param aEvent The 'drop' event.
    */
-  _dragover: function DropTargetShim_dragover(aEvent) {
-    let sourceNode = aEvent.dataTransfer.mozSourceNode.parentNode;
-    gDrag.drag(sourceNode._newtabSite, aEvent);
+  _drop: function (aEvent) {
+    // We're accepting all drops.
+    aEvent.preventDefault();
 
-    this._drag(aEvent);
+    // remember that drop event was seen, this explicitly
+    // assumes that drop event preceeds dragend event
+    this._dropSeen = true;
+
+    // Make sure to determine the current drop target
+    // in case the dragover event hasn't been fired.
+    this._updateDropTarget(aEvent);
+
+    // A site was successfully dropped.
+    this._dispatchEvent(aEvent, "drop", this._lastDropTarget);
   },
 
   /**
    * Handles the 'dragend' event.
    * @param aEvent The 'dragend' event.
    */
-  _end: function DropTargetShim_end(aEvent) {
-    // Make sure to determine the current drop target in case the dragenter
-    // event hasn't been fired.
-    this._drag(aEvent);
-
+  _dragend: function (aEvent) {
     if (this._lastDropTarget) {
-      if (aEvent.dataTransfer.mozUserCancelled) {
-        // The drag operation was cancelled.
+      if (aEvent.dataTransfer.mozUserCancelled || !this._dropSeen) {
+        // The drag operation was cancelled or no drop event was generated
         this._dispatchEvent(aEvent, "dragexit", this._lastDropTarget);
         this._dispatchEvent(aEvent, "dragleave", this._lastDropTarget);
-      } else {
-        // A site was successfully dropped.
-        this._dispatchEvent(aEvent, "drop", this._lastDropTarget);
       }
 
       // Clean up.
@@ -122,10 +142,35 @@ var gDropTargetShim = {
       this._cellPositions = null;
     }
 
+    this._dropSeen = false;
     gGrid.unlock();
+    this._removeEventListeners();
+  },
 
-    // XXX bug 505521 - Remove the document's dragover listener.
-    document.documentElement.removeEventListener("dragover", this, false);
+  /**
+   * Tries to find the current drop target and will fire
+   * appropriate dragenter, dragexit, and dragleave events.
+   * @param aEvent The current drag event.
+   */
+  _updateDropTarget: function (aEvent) {
+    // Let's see if we find a drop target.
+    let target = this._findDropTarget(aEvent);
+
+    if (target != this._lastDropTarget) {
+      if (this._lastDropTarget)
+        // We left the last drop target.
+        this._dispatchEvent(aEvent, "dragexit", this._lastDropTarget);
+
+      if (target)
+        // We're now hovering a (new) drop target.
+        this._dispatchEvent(aEvent, "dragenter", target);
+
+      if (this._lastDropTarget)
+        // We left the last drop target.
+        this._dispatchEvent(aEvent, "dragleave", this._lastDropTarget);
+
+      this._lastDropTarget = target;
+    }
   },
 
   /**
@@ -133,7 +178,7 @@ var gDropTargetShim = {
    * against all cells in the grid.
    * @return The currently hovered drop target or null.
    */
-  _findDropTarget: function DropTargetShim_findDropTarget() {
+  _findDropTarget: function () {
     // These are the minimum intersection values - we want to use the cell if
     // the site is >= 50% hovering its position.
     let minWidth = gDrag.cellWidth / 2;
@@ -174,13 +219,12 @@ var gDropTargetShim = {
    * @param aType The event type.
    * @param aTarget The target node that receives the event.
    */
-  _dispatchEvent:
-    function DropTargetShim_dispatchEvent(aEvent, aType, aTarget) {
-
+  _dispatchEvent: function (aEvent, aType, aTarget) {
     let node = aTarget.node;
-    let event = document.createEvent("DragEvents");
+    let event = document.createEvent("DragEvent");
 
-    event.initDragEvent(aType, true, true, window, 0, 0, 0, 0, 0, false, false,
+    // The event should not bubble to prevent recursion.
+    event.initDragEvent(aType, false, true, window, 0, 0, 0, 0, 0, false, false,
                         false, false, 0, node, aEvent.dataTransfer);
 
     node.dispatchEvent(event);
diff --git a/application/palemoon/base/content/newtab/grid.js b/application/palemoon/base/content/newtab/grid.js
index fbeb7bd27..be5a57c4b 100644
--- a/application/palemoon/base/content/newtab/grid.js
+++ b/application/palemoon/base/content/newtab/grid.js
@@ -5,6 +5,12 @@
 #endif
 
 /**
+ * Define various fixed dimensions
+ */
+const GRID_BOTTOM_EXTRA = 7; // title's line-height extends 7px past the margin
+const GRID_WIDTH_EXTRA = 1; // provide 1px buffer to allow for rounding error
+
+/**
  * This singleton represents the grid that contains all sites.
  */
 var gGrid = {
@@ -12,6 +18,7 @@ var gGrid = {
    * The DOM node of the grid.
    */
   _node: null,
+  _gridDefaultContent: null,
   get node() { return this._node; },
 
   /**
@@ -22,7 +29,7 @@ var gGrid = {
   /**
    * All cells contained in the grid.
    */
-  _cells: null,
+  _cells: [],
   get cells() { return this._cells; },
 
   /**
@@ -31,7 +38,10 @@ var gGrid = {
   get sites() { return [for (cell of this.cells) cell.site]; },
 
   // Tells whether the grid has already been initialized.
-  get ready() { return !!this._node; },
+  get ready() { return !!this._ready; },
+
+  // Returns whether the page has finished loading yet.
+  get isDocumentLoaded() { return document.readyState == "complete"; },
 
   /**
    * Initializes the grid.
@@ -39,8 +49,26 @@ var gGrid = {
    */
   init: function Grid_init() {
     this._node = document.getElementById("newtab-grid");
+    this._gridDefaultContent = this._node.lastChild;
     this._createSiteFragment();
-    this._render();
+
+    gLinks.populateCache(() => {
+      this._refreshGrid();
+      this._ready = true;
+
+      // If fetching links took longer than loading the page itself then
+      // we need to resize the grid as that was blocked until now.
+      // We also want to resize now if the page was already loaded when
+      // initializing the grid (the user toggled the page).
+      this._resizeGrid();
+
+      addEventListener("resize", this);
+    });
+
+    // Resize the grid as soon as the page loads.
+    if (!this.isDocumentLoaded) {
+      addEventListener("load", this);
+    }
   },
 
   /**
@@ -56,25 +84,15 @@ var gGrid = {
   },
 
   /**
-   * Refreshes the grid and re-creates all sites.
+   * Handles all grid events.
    */
-  refresh: function Grid_refresh() {
-    let cells = this.cells;
-    if (!cells) {
-      return;
+  handleEvent: function Grid_handleEvent(aEvent) {
+    switch (aEvent.type) {
+      case "load":
+      case "resize":
+        this._resizeGrid();
+        break;
     }
-
-    // Remove all sites.
-    cells.forEach(function (cell) {
-      let node = cell.node;
-      let child = node.firstElementChild;
-
-      if (child)
-        node.removeChild(child);
-    }, this);
-
-    // Render the grid again.
-    this._render();
   },
 
   /**
@@ -92,34 +110,62 @@ var gGrid = {
   },
 
   /**
-   * Creates the newtab grid.
+   * Renders and resizes the gird. _resizeGrid() call is needed to ensure
+   * that scrollbar disappears when the bottom row becomes empty following
+   * the block action, or tile display is turmed off via cog menu
+   */
+
+  refresh() {
+    this._refreshGrid();
+    this._resizeGrid();
+  },
+
+  /**
+   * Renders the grid, including cells and sites.
    */
-  _renderGrid: function Grid_renderGrid() {
-    let row = document.createElementNS(HTML_NAMESPACE, "div");
+  _refreshGrid() {
     let cell = document.createElementNS(HTML_NAMESPACE, "div");
-    row.classList.add("newtab-row");
     cell.classList.add("newtab-cell");
 
-    // Clear the grid
-    this._node.innerHTML = "";
-
-    // Creates the structure of one row
-    for (let i = 0; i < gGridPrefs.gridColumns; i++) {
-      row.appendChild(cell.cloneNode(true));
+    // Creates all the cells up to the maximum
+    let fragment = document.createDocumentFragment();
+    for (let i = 0; i < gGridPrefs.gridColumns * gGridPrefs.gridRows; i++) {
+      fragment.appendChild(cell.cloneNode(true));
     }
-    // Creates the grid
-    for (let j = 0; j < gGridPrefs.gridRows; j++) {
-      this._node.appendChild(row.cloneNode(true));
+
+    // Create cells.
+    let cells = Array.from(fragment.childNodes, (cell) => new Cell(this, cell));
+
+    // Fetch links.
+    let links = gLinks.getLinks();
+
+    // Create sites.
+    let numLinks = Math.min(links.length, cells.length);
+    let hasHistoryTiles = false;
+    for (let i = 0; i < numLinks; i++) {
+      if (links[i]) {
+        this.createSite(links[i], cells[i]);
+        if (links[i].type == "history") {
+          hasHistoryTiles = true;
+        }
+      }
     }
 
-    // (Re-)initialize all cells.
-    let cellElements = this.node.querySelectorAll(".newtab-cell");
-    // Tycho: this._cells = [new Cell(this, cell) for (cell of cellElements)];
-    this._cells = [];
-    
-    for (let cellItem of cellElements) {
-      this._cells.push(new Cell(this, cellItem));
+    this._cells = cells;
+    while (this._gridDefaultContent.nextSibling) {
+      this._gridDefaultContent.nextSibling.remove();
     }
+    this._node.appendChild(fragment);
+  },
+
+  /**
+   * Calculate the height for a number of rows up to the maximum rows
+   * @param rows Number of rows defaulting to the max
+   */
+  _computeHeight: function Grid_computeHeight(aRows) {
+    let {gridRows} = gGridPrefs;
+    aRows = aRows === undefined ? gridRows : Math.min(gridRows, aRows);
+    return aRows * this._cellHeight + GRID_BOTTOM_EXTRA;
   },
 
   /**
@@ -133,7 +179,8 @@ var gGrid = {
     // Create the site's inner HTML code.
     site.innerHTML =
       '<a class="newtab-link">' +
-      '  <span class="newtab-thumbnail"/>' +
+      '  <span class="newtab-thumbnail placeholder"/>' +
+      '  <span class="newtab-thumbnail thumbnail"/>' +
       '  <span class="newtab-title"/>' +
       '</a>' +
       '<input type="button" title="' + newTabString("pin") + '"' +
@@ -146,36 +193,80 @@ var gGrid = {
   },
 
   /**
-   * Renders the sites, creates all sites and puts them into their cells.
+   * Test a tile at a given position for being pinned or history
+   * @param position Position in sites array
    */
-  _renderSites: function Grid_renderSites() {
-    let cells = this.cells;
-    // Put sites into the cells.
-    let links = gLinks.getLinks();
-    let length = Math.min(links.length, cells.length);
-
-    for (let i = 0; i < length; i++) {
-      if (links[i])
-        this.createSite(links[i], cells[i]);
-    }
+  _isHistoricalTile: function Grid_isHistoricalTile(aPos) {
+    let site = this.sites[aPos];
+    return site && (site.isPinned() || site.link && site.link.type == "history");
   },
 
   /**
-   * Renders the grid.
+   * Make sure the correct number of rows and columns are visible
    */
-  _render: function Grid_render() {
-    if (this._shouldRenderGrid()) {
-      this._renderGrid();
+  _resizeGrid: function Grid_resizeGrid() {
+    // If we're somehow called before the page has finished loading,
+    // let's bail out to avoid caching zero heights and widths.
+    // We'll be called again when DOMContentLoaded fires.
+    // Same goes for the grid if that's not ready yet.
+    if (!this.isDocumentLoaded || !this._ready) {
+      return;
     }
 
-    this._renderSites();
-  },
+    // Save the cell's computed height/width including margin and border
+    if (this._cellHeight === undefined) {
+      let refCell = document.querySelector(".newtab-cell");
+      let style = getComputedStyle(refCell);
+      this._cellHeight = refCell.offsetHeight +
+        parseFloat(style.marginTop) + parseFloat(style.marginBottom);
+      this._cellWidth = refCell.offsetWidth +
+        parseFloat(style.marginLeft) + parseFloat(style.marginRight);
+    }
+
+    let searchContainer = document.querySelector("#searchContainer");
+    // Save search-container margin height
+    if (this._searchContainerMargin === undefined) {
+      let style = getComputedStyle(searchContainer);
+      this._searchContainerMargin = parseFloat(style.marginBottom) +
+                                    parseFloat(style.marginTop);
+    }
+
+    // Find the number of rows we can place into view port
+    let availHeight = document.documentElement.clientHeight -
+                      searchContainer.offsetHeight - this._searchContainerMargin;
+    let visibleRows = Math.floor(availHeight / this._cellHeight);
+
+    // Find the number of columns that fit into view port
+    let maxGridWidth = gGridPrefs.gridColumns * this._cellWidth + GRID_WIDTH_EXTRA;
+    // available width is current grid width, but no greater than maxGridWidth
+    let availWidth = Math.min(document.querySelector("#newtab-grid").clientWidth,
+                              maxGridWidth);
+    // finally get the number of columns we can fit into view port
+    let gridColumns = Math.floor(availWidth / this._cellWidth);
+    // walk sites backwords until a pinned or history tile is found or visibleRows reached
+    let tileIndex = Math.min(gGridPrefs.gridRows * gridColumns, this.sites.length) - 1;
+    while (tileIndex >= visibleRows * gridColumns) {
+      if (this._isHistoricalTile(tileIndex)) {
+        break;
+      }
+      tileIndex--;
+    }
 
-  _shouldRenderGrid : function Grid_shouldRenderGrid() {
-    let rowsLength = this._node.querySelectorAll(".newtab-row").length;
-    let cellsLength = this._node.querySelectorAll(".newtab-cell").length;
+    // Compute the actual number of grid rows we will display (potentially
+    // with a scroll bar). tileIndex now points to a historical tile with
+    // heighest index or to the last index of the visible row, if none found
+    // Dividing tileIndex by number of tiles in a column gives the rows
+    let gridRows = Math.floor(tileIndex / gridColumns) + 1;
 
-    return (rowsLength != gGridPrefs.gridRows ||
-            cellsLength != (gGridPrefs.gridRows * gGridPrefs.gridColumns));
+    // we need to set grid width, for otherwise the scrollbar may shrink
+    // the grid when shown and cause grid layout to be different from
+    // what being computed above. This, in turn, may cause scrollbar shown
+    // for directory tiles, and introduce jitter when grid width is aligned
+    // exactly on the column boundary
+    this._node.style.width = gridColumns * this._cellWidth + "px";
+    this._node.style.maxWidth = gGridPrefs.gridColumns * this._cellWidth +
+                                GRID_WIDTH_EXTRA + "px";
+    this._node.style.height = this._computeHeight() + "px";
+    this._node.style.maxHeight = this._computeHeight(gridRows) + "px";
   }
 };
diff --git a/application/palemoon/base/content/newtab/newTab.css b/application/palemoon/base/content/newtab/newTab.css
index 830e4a8c1..a5431cf65 100644
--- a/application/palemoon/base/content/newtab/newTab.css
+++ b/application/palemoon/base/content/newtab/newTab.css
@@ -2,26 +2,37 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-input[type=button] {
-  cursor: pointer;
+html {
+  width: 100%;
+  height: 100%;
 }
 
-/* SCROLLBOX */
-#newtab-scrollbox {
+body {
+  font: message-box;
+  width: 100%;
+  height: 100%;
+  padding: 0;
+  margin: 0;
+  background-color: #F9F9F9;
   display: -moz-box;
   position: relative;
   -moz-box-flex: 1;
   -moz-user-focus: normal;
+  -moz-box-orient: vertical;
 }
 
-#newtab-scrollbox:not([page-disabled]) {
-  overflow: auto;
+input {
+  font: message-box;
+  font-size: 16px;
+}
+
+input[type=button] {
+  cursor: pointer;
 }
 
 /* UNDO */
 #newtab-undo-container {
   transition: opacity 100ms ease-out;
-  display: -moz-box;
   -moz-box-align: center;
   -moz-box-pack: center;
 }
@@ -31,18 +42,6 @@ input[type=button] {
   pointer-events: none;
 }
 
-/* TOGGLE */
-#newtab-toggle {
-  position: absolute;
-  top: 12px;
-  right: 12px;
-}
-
-#newtab-toggle:-moz-locale-dir(rtl) {
-  left: 12px;
-  right: auto;
-}
-
 /* MARGINS */
 #newtab-vertical-margin {
   display: -moz-box;
@@ -51,40 +50,52 @@ input[type=button] {
   -moz-box-orient: vertical;
 }
 
-#newtab-margin-top {
-  min-height: 50px;
-  max-height: 80px;
+#newtab-margin-undo-container {
+  display: -moz-box;
+  left: 6px;
+  position: absolute;
+  top: 6px;
+  z-index: 1;
+}
+
+#newtab-margin-undo-container:dir(rtl) {
+  left: auto;
+  right: 6px;
+}
+
+#newtab-undo-close-button:dir(rtl) {
+  float:left;
+}
+
+#newtab-horizontal-margin {
   display: -moz-box;
   -moz-box-flex: 1;
-  -moz-box-align: center;
-  -moz-box-pack: center;
 }
 
+#newtab-margin-top,
 #newtab-margin-bottom {
-  min-height: 40px;
-  max-height: 100px;
+  display: -moz-box;
+  position: relative;
+}
+
+#newtab-margin-top {
   -moz-box-flex: 1;
 }
 
-#newtab-horizontal-margin {
-  display: -moz-box;
-  -moz-box-flex: 5;
+#newtab-margin-bottom {
+  -moz-box-flex: 2;
 }
 
 .newtab-side-margin {
-  min-width: 40px;
-  max-width: 300px;
+  min-width: 10px;
   -moz-box-flex: 1;
 }
 
 /* GRID */
 #newtab-grid {
-  display: -moz-box;
   -moz-box-flex: 5;
-  -moz-box-orient: vertical;
-  min-width: 600px;
-  min-height: 400px;
-  transition: 100ms ease-out;
+  overflow: hidden;
+  transition: 300ms ease-out;
   transition-property: opacity;
 }
 
@@ -97,25 +108,25 @@ input[type=button] {
   pointer-events: none;
 }
 
-/* ROWS */
-.newtab-row {
-  display: -moz-box;
-  -moz-box-orient: horizontal;
-  -moz-box-direction: normal;
-  -moz-box-flex: 1;
-}
-
+/*
+ * If you change the sizes here, make sure you
+ * change the preferences:
+ * toolkit.pageThumbs.minWidth
+ * toolkit.pageThumbs.minHeight
+ */
 /* CELLS */
 .newtab-cell {
   display: -moz-box;
-  -moz-box-flex: 1;
+  height: 180px;
+  margin: 15px 10px 30px;
+  width: 250px;
 }
 
 /* SITES */
 .newtab-site {
   position: relative;
   -moz-box-flex: 1;
-  transition: 100ms ease-out;
+  transition: 200ms ease-out;
   transition-property: top, left, opacity;
 }
 
@@ -139,38 +150,35 @@ input[type=button] {
   bottom: 0;
 }
 
-.newtab-thumbnail {
-  opacity: .8;
-  transition: opacity 100ms ease-out;
-}
-
-.newtab-thumbnail[dragged],
-.newtab-link:-moz-focusring > .newtab-thumbnail,
-.newtab-site:hover > .newtab-link > .newtab-thumbnail {
-  opacity: 1;
-}
-
 /* TITLES */
 .newtab-title {
+  overflow: hidden;
   position: absolute;
-  left: 0;
   right: 0;
+  text-align: center;
+}
+
+.newtab-title {
   bottom: 0;
   white-space: nowrap;
-  overflow: hidden;
   text-overflow: ellipsis;
+  vertical-align: middle;
+}
+
+.newtab-title {
+  left: 0;
+  padding: 0 4px;
 }
 
 /* CONTROLS */
 .newtab-control {
   position: absolute;
-  top: 4px;
   opacity: 0;
   transition: opacity 100ms ease-out;
 }
 
 .newtab-control:-moz-focusring,
-.newtab-site:hover > .newtab-control {
+.newtab-cell:not([ignorehover]) > .newtab-site:hover > .newtab-control {
   opacity: 1;
 }
 
@@ -184,16 +192,6 @@ input[type=button] {
   }
 }
 
-.newtab-control-pin:-moz-locale-dir(ltr),
-.newtab-control-block:-moz-locale-dir(rtl) {
-  left: 4px;
-}
-
-.newtab-control-block:-moz-locale-dir(ltr),
-.newtab-control-pin:-moz-locale-dir(rtl) {
-  right: 4px;
-}
-
 /* DRAG & DROP */
 
 /*
@@ -207,3 +205,124 @@ input[type=button] {
   background-color: #fff;
   opacity: 0.01;
 }
+
+/* SEARCH */
+#searchContainer {
+  display: -moz-box;
+  position: relative;
+  -moz-box-pack: center;
+  margin: 40px 0 15px;
+}
+
+#searchContainer[page-disabled] {
+  opacity: 0;
+  pointer-events: none;
+}
+
+#searchForm {
+  display: -moz-box;
+  position: relative;
+  height: 36px;
+  -moz-box-flex: 1;
+  max-width: 600px; /* 2 * (290 cell width + 10 cell margin) */
+}
+
+#searchEngineLogo {
+  border: 1px transparent;
+  padding: 2px 4px;
+  margin: 0;
+  width: 32px;
+  height: 32px;
+  position: absolute;
+}
+
+#searchText {
+  -moz-box-flex: 1;
+  padding-top: 6px;
+  padding-bottom: 6px;
+  padding-inline-start: 42px;
+  padding-inline-end: 8px;
+  background: hsla(0,0%,100%,.9) padding-box;
+  border: 1px solid;
+  border-spacing: 0;
+  border-radius: 2px 0 0 2px;
+  border-color: hsla(210,54%,20%,.15) hsla(210,54%,20%,.17) hsla(210,54%,20%,.2);
+  box-shadow: 0 1px 0 hsla(210,65%,9%,.02) inset,
+              0 0 2px hsla(210,65%,9%,.1) inset,
+              0 1px 0 hsla(0,0%,100%,.2);
+  color: inherit;
+  unicode-bidi: plaintext;
+}
+
+#searchText:dir(rtl) {
+  border-radius: 0 2px 2px 0;
+}
+
+#searchText[aria-expanded="true"] {
+  border-radius: 2px 0 0 0;
+}
+
+#searchText[aria-expanded="true"]:dir(rtl) {
+  border-radius: 0 2px 0 0;
+}
+
+#searchText[keepfocus],
+#searchText:focus {
+  border-color: hsla(216,100%,60%,.6) hsla(216,76%,52%,.6) hsla(214,100%,40%,.6);
+}
+
+#searchSubmit {
+  margin-inline-start: -1px;
+  padding: 0;
+  border: 1px solid;
+  background-color: #e0e0e0;
+  color: black;
+  border-color: hsla(220,54%,20%,.15) hsla(220,54%,20%,.17) hsla(220,54%,20%,.2);
+  border-radius: 0 2px 2px 0;
+  border-inline-start: 1px solid transparent;
+  box-shadow: 0 0 2px hsla(0,0%,100%,.5) inset,
+              0 1px 0 hsla(0,0%,100%,.2);
+  cursor: pointer;
+  transition-property: background-color, border-color, box-shadow;
+  transition-duration: 150ms;
+  width: 50px;
+}
+
+#searchSubmit:dir(rtl) {
+  border-radius: 2px 0 0 2px;
+}
+
+#searchSubmit:hover {
+  background-color: hsl(220,54%,20%);
+  color: white;
+}
+
+#searchText:focus + #searchSubmit,
+#searchText + #searchSubmit:hover {
+  border-color: #5985fc #4573e7 #3264d5;
+}
+
+#searchText:focus + #searchSubmit,
+#searchText[keepfocus] + #searchSubmit {
+  box-shadow: 0 1px 0 hsla(0,0%,100%,.2) inset,
+              0 0 0 1px hsla(0,0%,100%,.1) inset,
+              0 1px 0 hsla(220,54%,20%,.03);
+}
+
+#searchText + #searchSubmit:hover {
+  box-shadow: 0 1px 0 hsla(0,0%,100%,.2) inset,
+              0 0 0 1px hsla(0,0%,100%,.1) inset,
+              0 1px 0 hsla(220,54%,20%,.03),
+              0 0 4px hsla(216,100%,20%,.2);
+}
+
+#searchText + #searchSubmit:hover:active {
+  box-shadow: 0 1px 1px hsla(221,79%,6%,.1) inset,
+              0 0 1px hsla(221,79%,6%,.2) inset;
+  transition-duration: 0ms;
+}
+
+.contentSearchSuggestionTable {
+  font: message-box;
+  font-size: 16px;
+}
diff --git a/application/palemoon/base/content/newtab/newTab.js b/application/palemoon/base/content/newtab/newTab.js
index bea545ab5..0022f21bb 100644
--- a/application/palemoon/base/content/newtab/newTab.js
+++ b/application/palemoon/base/content/newtab/newTab.js
@@ -10,6 +10,7 @@ var Ci = Components.interfaces;
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource://gre/modules/PageThumbs.jsm");
+Cu.import("resource://gre/modules/BackgroundPageThumbs.jsm");
 Cu.import("resource://gre/modules/NewTabUtils.jsm");
 
 XPCOMUtils.defineLazyModuleGetter(this, "Rect",
@@ -31,13 +32,24 @@ XPCOMUtils.defineLazyGetter(this, "gStringBundle", function() {
     createBundle("chrome://browser/locale/newTab.properties");
 });
 
-function newTabString(name) gStringBundle.GetStringFromName('newtab.' + name);
+function newTabString(name, args) {
+  let stringName = "newtab." + name;
+  if (!args) {
+    return gStringBundle.GetStringFromName(stringName);
+  }
+  return gStringBundle.formatStringFromName(stringName, args, args.length);
+}
 
 function inPrivateBrowsingMode() {
-  return PrivateBrowsingUtils.isWindowPrivate(window);
+  return PrivateBrowsingUtils.isContentWindowPrivate(window);
 }
 
 const HTML_NAMESPACE = "http://www.w3.org/1999/xhtml";
+const XUL_NAMESPACE = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
+
+const TILES_EXPLAIN_LINK = "https://support.mozilla.org/kb/how-do-tiles-work-firefox";
+const TILES_INTRO_LINK = "https://www.mozilla.org/firefox/tiles/";
+const TILES_PRIVACY_LINK = "https://www.mozilla.org/privacy/";
 
 #include transformations.js
 #include page.js
@@ -51,6 +63,7 @@ const HTML_NAMESPACE = "http://www.w3.org/1999/xhtml";
 #include dropPreview.js
 #include updater.js
 #include undo.js
+#include search.js
 
 // Everything is loaded. Initialize the New Tab Page.
 gPage.init();
diff --git a/application/palemoon/base/content/newtab/newTab.xhtml b/application/palemoon/base/content/newtab/newTab.xhtml
new file mode 100644
index 000000000..eac62c987
--- /dev/null
+++ b/application/palemoon/base/content/newtab/newTab.xhtml
@@ -0,0 +1,60 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<!DOCTYPE html [
+  <!ENTITY % newTabDTD SYSTEM "chrome://browser/locale/newTab.dtd">
+  %newTabDTD;
+  <!ENTITY % browserDTD SYSTEM "chrome://browser/locale/browser.dtd">
+  %browserDTD;
+  <!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd">
+  %globalDTD;
+]>
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <title>&newtab.pageTitle;</title>
+
+  <link rel="stylesheet" type="text/css" media="all" href="chrome://global/skin/" />
+  <link rel="stylesheet" type="text/css" media="all" href="chrome://browser/content/newtab/newTab.css" />
+  <link rel="stylesheet" type="text/css" media="all" href="chrome://browser/skin/newtab/newTab.css" />
+</head>
+
+<body dir="&locale.dir;">
+  <div id="newtab-vertical-margin">
+    <div id="newtab-margin-top"/>
+
+    <div id="newtab-margin-undo-container">
+      <div id="newtab-undo-container" undo-disabled="true">
+        <label id="newtab-undo-label">&newtab.undo.removedLabel;</label>
+        <button id="newtab-undo-button" tabindex="-1"
+                class="newtab-undo-button">&newtab.undo.undoButton;</button>
+        <button id="newtab-undo-restore-button" tabindex="-1"
+                class="newtab-undo-button">&newtab.undo.restoreButton;</button>
+        <button id="newtab-undo-close-button" tabindex="-1" title="&newtab.undo.closeTooltip;"/>
+      </div>
+    </div>
+
+    <div id="searchContainer">
+      <form name="searchForm" id="searchForm" onsubmit="onSearchSubmit(event)">
+        <div id="searchLogoContainer"><img id="searchEngineLogo"/></div>
+        <input type="text" name="q" value="" id="searchText" maxlength="256"/>
+        <input id="searchSubmit" type="submit" value="&newtab.searchEngineButton.label;"/>
+      </form>
+    </div>
+
+    <div id="newtab-horizontal-margin">
+      <div class="newtab-side-margin"/>
+      <div id="newtab-grid">
+      <!-- site grid -->
+      </div>
+      <div class="newtab-side-margin"/>
+    </div>
+
+    <div id="newtab-margin-bottom"/>
+  </div>
+</body>
+<script type="text/javascript;version=1.8" src="chrome://browser/content/newtab/newTab.js"/>
+</html>
diff --git a/application/palemoon/base/content/newtab/newTab.xul b/application/palemoon/base/content/newtab/newTab.xul
deleted file mode 100644
index 6fc202f29..000000000
--- a/application/palemoon/base/content/newtab/newTab.xul
+++ /dev/null
@@ -1,55 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
-<?xml-stylesheet href="chrome://browser/content/newtab/newTab.css" type="text/css"?>
-<?xml-stylesheet href="chrome://browser/skin/newtab/newTab.css" type="text/css"?>
-
-<!DOCTYPE window [
-  <!ENTITY % newTabDTD SYSTEM "chrome://browser/locale/newTab.dtd">
-  %newTabDTD;
-]>
-
-<xul:window id="newtab-window" xmlns="http://www.w3.org/1999/xhtml"
-            xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-            title="&newtab.pageTitle;">
-
-  <div id="newtab-scrollbox">
-
-    <div id="newtab-vertical-margin">
-      <div id="newtab-margin-top">
-        <div id="newtab-undo-container" undo-disabled="true">
-          <xul:label id="newtab-undo-label"
-                     value="&newtab.undo.removedLabel;" />
-          <xul:button id="newtab-undo-button" tabindex="-1"
-                      label="&newtab.undo.undoButton;"
-                      class="newtab-undo-button" />
-          <xul:button id="newtab-undo-restore-button" tabindex="-1"
-                      label="&newtab.undo.restoreButton;"
-                      class="newtab-undo-button" />
-          <xul:toolbarbutton id="newtab-undo-close-button" tabindex="-1"
-                             class="close-icon"
-                             tooltiptext="&newtab.undo.closeTooltip;" />
-        </div>
-      </div>
-
-      <div id="newtab-horizontal-margin">
-        <div class="newtab-side-margin"/>
-
-        <div id="newtab-grid">
-        </div>
-
-        <div class="newtab-side-margin"/>
-      </div>
-
-      <div id="newtab-margin-bottom"/>
-    </div>
-    <input id="newtab-toggle" type="button"/>
-  </div>
-
-  <xul:script type="text/javascript;version=1.8"
-              src="chrome://browser/content/newtab/newTab.js"/>
-</xul:window>
diff --git a/application/palemoon/base/content/newtab/page.js b/application/palemoon/base/content/newtab/page.js
index fc836a55e..cbd6750b6 100644
--- a/application/palemoon/base/content/newtab/page.js
+++ b/application/palemoon/base/content/newtab/page.js
@@ -4,6 +4,9 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 #endif
 
+// The amount of time we wait while coalescing updates for hidden pages.
+const SCHEDULE_UPDATE_TIMEOUT_MS = 1000;
+
 /**
  * This singleton represents the whole 'New Tab Page' and takes care of
  * initializing all its components.
@@ -19,9 +22,10 @@ var gPage = {
     // Listen for 'unload' to unregister this page.
     addEventListener("unload", this, false);
 
-    // Listen for toggle button clicks.
-    let button = document.getElementById("newtab-toggle");
-    button.addEventListener("click", this, false);
+    // XXX bug 991111 - Not all click events are correctly triggered when
+    // listening from xhtml nodes -- in particular middle clicks on sites, so
+    // listen from the xul window and filter then delegate
+    addEventListener("click", this, false);
 
     // Check if the new tab feature is enabled.
     let enabled = gAllPages.enabled;
@@ -34,26 +38,65 @@ var gPage = {
   /**
    * Listens for notifications specific to this page.
    */
-  observe: function Page_observe() {
-    let enabled = gAllPages.enabled;
-    this._updateAttributes(enabled);
+  observe: function Page_observe(aSubject, aTopic, aData) {
+    if (aTopic == "nsPref:changed") {
+      let enabled = gAllPages.enabled;
+      this._updateAttributes(enabled);
 
-    // Initialize the whole page if we haven't done that, yet.
-    if (enabled) {
-      this._init();
-    } else {
-      gUndoDialog.hide();
+      // Update thumbnails to the new enhanced setting
+      if (aData == "browser.newtabpage.enhanced") {
+        this.update();
+      }
+
+      // Initialize the whole page if we haven't done that, yet.
+      if (enabled) {
+        this._init();
+      } else {
+        gUndoDialog.hide();
+      }
+    } else if (aTopic == "page-thumbnail:create" && gGrid.ready) {
+      for (let site of gGrid.sites) {
+        if (site && site.url === aData) {
+          site.refreshThumbnail();
+        }
+      }
     }
   },
 
   /**
-   * Updates the whole page and the grid when the storage has changed.
+   * Updates the page's grid right away for visible pages. If the page is
+   * currently hidden, i.e. in a background tab or in the preloader, then we
+   * batch multiple update requests and refresh the grid once after a short
+   * delay. Accepts a single parameter the specifies the reason for requesting
+   * a page update. The page may decide to delay or prevent a requested updated
+   * based on the given reason.
    */
-  update: function Page_update() {
-    // The grid might not be ready yet as we initialize it asynchronously.
-    if (gGrid.ready) {
-      gGrid.refresh();
+  update(reason = "") {
+    // Update immediately if we're visible.
+    if (!document.hidden) {
+      // Ignore updates where reason=links-changed as those signal that the
+      // provider's set of links changed. We don't want to update visible pages
+      // in that case, it is ok to wait until the user opens the next tab.
+      if (reason != "links-changed" && gGrid.ready) {
+        gGrid.refresh();
+      }
+
+      return;
+    }
+
+    // Bail out if we scheduled before.
+    if (this._scheduleUpdateTimeout) {
+      return;
     }
+
+    this._scheduleUpdateTimeout = setTimeout(() => {
+      // Refresh if the grid is ready.
+      if (gGrid.ready) {
+        gGrid.refresh();
+      }
+
+      this._scheduleUpdateTimeout = null;
+    }, SCHEDULE_UPDATE_TIMEOUT_MS);
   },
 
   /**
@@ -66,19 +109,28 @@ var gPage = {
 
     this._initialized = true;
 
-    gLinks.populateCache(function () {
-      // Initialize and render the grid.
-      gGrid.init();
+    // Set submit button label for when CSS background are disabled (e.g.
+    // high contrast mode).
+    document.getElementById("searchSubmit").value =
+      document.body.getAttribute("dir") == "ltr" ? "\u25B6" : "\u25C0";
+
+    if (document.hidden) {
+      addEventListener("visibilitychange", this);
+    } else {
+      setTimeout(() => this.onPageFirstVisible());
+    }
+
+    // Initialize and render the grid.
+    gGrid.init();
 
-      // Initialize the drop target shim.
-      gDropTargetShim.init();
+    // Initialize the drop target shim.
+    gDropTargetShim.init();
 
 #ifdef XP_MACOSX
-      // Workaround to prevent a delay on MacOSX due to a slow drop animation.
-      document.addEventListener("dragover", this, false);
-      document.addEventListener("drop", this, false);
+    // Workaround to prevent a delay on MacOSX due to a slow drop animation.
+    document.addEventListener("dragover", this, false);
+    document.addEventListener("drop", this, false);
 #endif
-    }.bind(this));
   },
 
   /**
@@ -87,7 +139,7 @@ var gPage = {
    */
   _updateAttributes: function Page_updateAttributes(aValue) {
     // Set the nodes' states.
-    let nodeSelector = "#newtab-scrollbox, #newtab-toggle, #newtab-grid";
+    let nodeSelector = "#newtab-grid, #searchContainer";
     for (let node of document.querySelectorAll(nodeSelector)) {
       if (aValue)
         node.removeAttribute("page-disabled");
@@ -98,15 +150,28 @@ var gPage = {
     // Enables/disables the control and link elements.
     let inputSelector = ".newtab-control, .newtab-link";
     for (let input of document.querySelectorAll(inputSelector)) {
-      if (aValue) 
+      if (aValue)
         input.removeAttribute("tabindex");
       else
         input.setAttribute("tabindex", "-1");
     }
+  },
 
-    // Update the toggle button's title.
-    let toggle = document.getElementById("newtab-toggle");
-    toggle.setAttribute("title", newTabString(aValue ? "hide" : "show"));
+  /**
+   * Handles unload event
+   */
+  _handleUnloadEvent: function Page_handleUnloadEvent() {
+    gAllPages.unregister(this);
+    // compute page life-span and send telemetry probe: using milli-seconds will leave
+    // many low buckets empty. Instead we use half-second precision to make low end
+    // of histogram linear and not lose the change in user attention
+    let delta = Math.round((Date.now() - this._firstVisibleTime) / 500);
+    if (this._suggestedTilePresent) {
+      Services.telemetry.getHistogramById("NEWTAB_PAGE_LIFE_SPAN_SUGGESTED").add(delta);
+    }
+    else {
+      Services.telemetry.getHistogramById("NEWTAB_PAGE_LIFE_SPAN").add(delta);
+    }
   },
 
   /**
@@ -114,11 +179,22 @@ var gPage = {
    */
   handleEvent: function Page_handleEvent(aEvent) {
     switch (aEvent.type) {
+      case "load":
+        this.onPageVisibleAndLoaded();
+        break;
       case "unload":
-        gAllPages.unregister(this);
+        this._handleUnloadEvent();
         break;
       case "click":
-        gAllPages.enabled = !gAllPages.enabled;
+        let {button, target} = aEvent;
+        // Go up ancestors until we find a Site or not
+        while (target) {
+          if (target.hasOwnProperty("_newtabSite")) {
+            target._newtabSite.onClick(aEvent);
+            break;
+          }
+          target = target.parentNode;
+        }
         break;
       case "dragover":
         if (gDrag.isValid(aEvent) && gDrag.draggedSite)
@@ -130,6 +206,78 @@ var gPage = {
           aEvent.stopPropagation();
         }
         break;
+      case "visibilitychange":
+        // Cancel any delayed updates for hidden pages now that we're visible.
+        if (this._scheduleUpdateTimeout) {
+          clearTimeout(this._scheduleUpdateTimeout);
+          this._scheduleUpdateTimeout = null;
+
+          // An update was pending so force an update now.
+          this.update();
+        }
+
+        setTimeout(() => this.onPageFirstVisible());
+        removeEventListener("visibilitychange", this);
+        break;
+    }
+  },
+
+  onPageFirstVisible: function () {
+    // Record another page impression.
+    Services.telemetry.getHistogramById("NEWTAB_PAGE_SHOWN").add(true);
+
+    for (let site of gGrid.sites) {
+      if (site) {
+        // The site may need to modify and/or re-render itself if
+        // something changed after newtab was created by preloader.
+        // For example, the suggested tile endTime may have passed.
+        site.onFirstVisible();
+      }
+    }
+
+    // save timestamp to compute page life-span delta
+    this._firstVisibleTime = Date.now();
+
+    if (document.readyState == "complete") {
+      this.onPageVisibleAndLoaded();
+    } else {
+      addEventListener("load", this);
     }
-  }
+  },
+
+  onPageVisibleAndLoaded() {
+    // Send the index of the last visible tile.
+    this.reportLastVisibleTileIndex();
+    // Maybe tell the user they can undo an initial automigration
+    this.maybeShowAutoMigrationUndoNotification();
+  },
+
+  reportLastVisibleTileIndex() {
+    let cwu = window.QueryInterface(Ci.nsIInterfaceRequestor)
+                    .getInterface(Ci.nsIDOMWindowUtils);
+
+    let rect = cwu.getBoundsWithoutFlushing(gGrid.node);
+    let nodes = cwu.nodesFromRect(rect.left, rect.top, 0, rect.width,
+                                  rect.height, 0, true, false);
+
+    let i = -1;
+    let lastIndex = -1;
+    let sites = gGrid.sites;
+
+    for (let node of nodes) {
+      if (node.classList && node.classList.contains("newtab-cell")) {
+        if (sites[++i]) {
+          lastIndex = i;
+          if (sites[i].link.targetedSite) {
+            // record that suggested tile is shown to use suggested-tiles-histogram
+            this._suggestedTilePresent = true;
+          }
+        }
+      }
+    }
+  },
+
+  maybeShowAutoMigrationUndoNotification() {
+    // sendAsyncMessage("NewTab:MaybeShowAutoMigrationUndoNotification");
+  },
 };
diff --git a/application/palemoon/base/content/newtab/search.js b/application/palemoon/base/content/newtab/search.js
new file mode 100644
index 000000000..8bc959eee
--- /dev/null
+++ b/application/palemoon/base/content/newtab/search.js
@@ -0,0 +1,134 @@
+#ifdef 0
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+#endif
+
+const SEARCH_ENGINES = {
+  "DuckDuckGo": {
+  	 image: "data:image/png;base64," +
+            "iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAMAAACdt4HsAAACT1BMVEXvISn/////9/fvUlr3ra3/" +
+            "zs7/7+/va2v/5+f/xsbvMTn/tbX/3t7/vb3vOUL3WmPvQkr/zgDvKTHvSlL3hIT3paX/1tbnISn3" +
+            "c3v3e3v3a3P3jIz3nJz/tb33c3PvKSn3lJT39/cAc73vSkr3e4Tv7+/3Yxj3pa3/tQj3jJT3nKX3" +
+            "Y2P/xs73hIzvQkL/vQjvQiHn5+f3hBD/ztbvMTH/vcb/3ucIc733lJz/pQilzufe7/fvMSHOzs73" +
+            "//cQrUpKvVprxmP3Y2vvShiUzmvWlJRzzmMYtUrvOTnn7/davVrWra3v9//nY2PvISGUxudztd7e" +
+            "3t7/76XvKSHea2v/xgDnOUK93vfW5/f/1t73Uhj/52ut3q2l3rXO784pjMZrrdb/rQjera3/5+/e" +
+            "paWMxufO79aEazkYrUr/nAj3jBD3axj3lBD///fehIRKpd7/1hCEYzk5vVL3//8ptVLW77UxtVLn" +
+            "SlLW1tZCvVp7vef/1gj/3invSkL//+fWtbXvpaX/3kr/97XvnJznWmMxjM5zvefOxsbWnKXWjIzG" +
+            "3u/ea3Pn997O5/fnQkqExuf3Whit1u/nUlrnxs7v5+d7zmuU1pT3exDOSjFjrVL/987/pUoQe8b/" +
+            "75T/3jFKxnO158bWKSl7zoRSxmtajEK1e0pzxlqcUjH/1iHOMSnOvb33cxDWnJx7td6EzmP/74xz" +
+            "azlrcznec3Pe771jxlpzczne78YpvVqEvWPn99YxvWOtSjHee3vG787OOTE5lEK1QjHv9+drzmve" +
+            "tbXO772q+r8wAAAFbUlEQVR4Xo2X84PzTBDHN3Zqu2fbemzbNl7atm3btvGHvTNJ2myuyd3NL2mT" +
+            "zmdnvjM76RImyGQlH5dCHBeSmscNmQkyfwBrZMLEY2aRF5cMSDYPEx+LZpUlAYRQbVEpnuc1je/M" +
+            "SbVwYoVFAbpE0IaLmiwqiVymmE3H84YuGs2mheCEhQH5qPUrje2ONxHKVIkXR2x2MxsMkDnLvftk" +
+            "2fSTQNCzSAgngwCCipkXxHiU+BsnCDFE8f6AQgnwaTGhkmDLymW8jPsBeIsth8iCpha618El1wgo" +
+            "4FOhWyWLWY+O8pbnAwTI29S1ElncJBmF4L0AGeJSdR4dUpt5w+DL0nAgoUuGGKKCBxDCOxrykaDb" +
+            "+yFQjhUylLlXpAB5jGnIqV6uvvWUcAAhLmDBXIAMrkXRdHQ+cerUiWefq1hRrAgg8LikUgdkQUAx" +
+            "6+2Ze0WLEO/1BQzrHCFNrAPAeDSD4q/Ln6R3p68MSYzDAUiwIEutJM0bHXE/gpEhJMxaAB3T6aT8" +
+            "mfkm+QBiMlwKFqAHvrHu9tvTOLrEdX4hFAkJWQB42qbVyam75ruv3zvF+wBCKJ0MAAV6SAy5+raA" +
+            "y+lb9tYBUw9sffKRJh+CDl2SAEAPquaC76swU1c+zlxbA9if/EIY78AcCBODDKjnVzDM0+sb57zq" +
+            "N14gdpbg4nraBaxm3NWpIDKNgJIIDTxEAKMyVM9/VrFcpijK52PbNhmk0RQORCA8dhGhIkDA+qPV" +
+            "Y/U8No2NHZsUfQCdzYTECSiRSRJKgxYAnK6+tnVrPYL7q2P7GNNnT0L3SQSS61AowK4BAExWq9XJ" +
+            "OmDT5D4GtUab7p92W1aD6AFBOjUKcONNKMG2o9vmScmhd+v5SCTS91StDLBwmHR5q0iiM4yv3X5g" +
+            "sD1i24tUHc0GQOrOihdw+ZV7drx+8I1IzfpaCQ1oSIGsbqEBdxy8KkLb8dYt7m7AFBpEJI8OUIAd" +
+            "Hve+wX509IqYgzLqxKMi5X+r6737wgHfMrZBKGwpQMWP0PN8/8qLn15cSRosEQeI3coxGrzRVfE2" +
+            "BEyTAMNpmbA3k2erPOyq+CUCPGvv3OmGykYBQhiYFbynDLu2uyW826qb7bSlv/VCe2R3vQqhIYQQ" +
+            "nLmSGKUAT1AqXn7V6p72iUsTThsNuhKUAeKMNFaiW2nG08H90IF1m6DywVdsHgA4bPgRGgAqUgBr" +
+            "DwxOtPcdv9RK6yklnaGKOXBMmN7RVCtJJMiUdG2s78dv9HbY7KrI9AQBOHwjaxaA6cKhRLXCHkpF" +
+            "PrAJYBz1su7LtSBQIjzozgI5AJDWsQ7gTJxETTHuEh5yW8kR5+1fvQBT5PDdWgPokE6GSuK3Aaby" +
+            "2KwNyGFIZ8/NfexVMAGXEfe8MA5QTVdrgGe2M9evev6FMwiAYr308nVzcx/SgHwSlswyLgDLHU0K" +
+            "tX5UZwCwZsM1b7516J1333v/g2UAuJoCNMsmZkEDZBXujCoOIfVJxQKsvXnDshvWfrEcAV9RAoqY" +
+            "rfdvHjY06R3tVmtjzQYsQ8ByC/C1O0dEzqkAGqELbiZ1W/RvBr51Ad9ZgO8dQCkh4/q5xvMC6hot" +
+            "sBl7rP1QT+HHQz9RGoSHhkyMgqEBdNPFWSWMY+1nBPxy+MjvZ2aZxB9n/zz3FwKiOTZfotb3AhhF" +
+            "xSUUNmGSjX+vWvPPYacVWJOkUilUT05ymEVb0JFHj9l/AVn+35b/jsx6YzNz8mja+iAEH7rYDntY" +
+            "Gaz3dizW080KWaeICx77kiG7lTKG6EEoPb0Wu0lZ9OA5whFH8GxHQjOMQls5HSs5t/glHX2FYtT/" +
+            "mGAs/fCtFU0vQJUSQYfvIBvVyukuLhbjuood/H6WCbD/AQSFvIO3JDxgAAAAAElFTkSuQmCC"
+  }
+};
+
+// This global tracks if the page has been set up before, to prevent double inits
+var gInitialized = false;
+var gObserver = new MutationObserver(function (mutations) {
+  for (let mutation of mutations) {
+    if (mutation.attributeName == "searchEngineURL") {
+      setupSearchEngine();
+      if (!gInitialized) {
+        gInitialized = true;
+      }
+      return;
+    }
+  }
+});
+
+window.addEventListener("pageshow", function () {
+  window.gObserver.observe(document.documentElement, { attributes: true });
+});
+
+window.addEventListener("pagehide", function() {
+  window.gObserver.disconnect();
+});
+
+function onSearchSubmit(aEvent) {
+  let searchTerms = document.getElementById("searchText").value;
+  let searchURL = document.documentElement.getAttribute("searchEngineURL");
+
+  if (searchURL && searchTerms.length > 0) {
+    const SEARCH_TOKEN = "_searchTerms_";
+    let searchPostData = document.documentElement.getAttribute("searchEnginePostData");
+    if (searchPostData) {
+      // Check if a post form already exists. If so, remove it.
+      const POST_FORM_NAME = "searchFormPost";
+      let form = document.forms[POST_FORM_NAME];
+      if (form) {
+        form.parentNode.removeChild(form);
+      }
+
+      // Create a new post form.
+      form = document.body.appendChild(document.createElement("form"));
+      form.setAttribute("name", POST_FORM_NAME);
+      // Set the URL to submit the form to.
+      form.setAttribute("action", searchURL.replace(SEARCH_TOKEN, searchTerms));
+      form.setAttribute("method", "post");
+
+      // Create new <input type=hidden> elements for search param.
+      searchPostData = searchPostData.split("&");
+      for (let postVar of searchPostData) {
+        let [name, value] = postVar.split("=");
+        if (value == SEARCH_TOKEN) {
+          value = searchTerms;
+        }
+        let input = document.createElement("input");
+        input.setAttribute("type", "hidden");
+        input.setAttribute("name", name);
+        input.setAttribute("value", value);
+        form.appendChild(input);
+      }
+      // Submit the form.
+      form.submit();
+    } else {
+      searchURL = searchURL.replace(SEARCH_TOKEN, encodeURIComponent(searchTerms));
+      window.location.href = searchURL;
+    }
+  }
+
+  aEvent.preventDefault();
+}
+
+
+function setupSearchEngine() {
+  let searchText = document.getElementById("searchText");
+  let searchEngineName = document.documentElement.getAttribute("searchEngineName");
+  let searchEngineInfo = SEARCH_ENGINES[searchEngineName];
+  let logoElt = document.getElementById("searchEngineLogo");
+
+  // Add search engine logo.
+  if (searchEngineInfo && searchEngineInfo.image) {
+    logoElt.parentNode.hidden = false;
+    logoElt.src = searchEngineInfo.image;
+    logoElt.alt = searchEngineName;
+    searchText.placeholder = "";
+  } else {
+    logoElt.parentNode.hidden = true;
+    searchText.placeholder = searchEngineName;
+  }
+}
diff --git a/application/palemoon/base/content/newtab/sites.js b/application/palemoon/base/content/newtab/sites.js
index 873ef201c..a368146bb 100644
--- a/application/palemoon/base/content/newtab/sites.js
+++ b/application/palemoon/base/content/newtab/sites.js
@@ -4,6 +4,9 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 #endif
 
+const THUMBNAIL_PLACEHOLDER_ENABLED =
+  Services.prefs.getBoolPref("browser.newtabpage.thumbnailPlaceholder");
+
 /**
  * This class represents a site that is contained in a cell and can be pinned,
  * moved around or deleted.
@@ -37,7 +40,7 @@ Site.prototype = {
   /**
    * The title of the site's link.
    */
-  get title() { return this.link.title; },
+  get title() { return this.link.title || this.link.url; },
 
   /**
    * The site's parent cell.
@@ -50,13 +53,19 @@ Site.prototype = {
   /**
    * Pins the site on its current or a given index.
    * @param aIndex The pinned index (optional).
+   * @return true if link changed type after pin
    */
   pin: function Site_pin(aIndex) {
     if (typeof aIndex == "undefined")
       aIndex = this.cell.index;
 
     this._updateAttributes(true);
-    gPinnedLinks.pin(this._link, aIndex);
+    let changed = gPinnedLinks.pin(this._link, aIndex);
+    if (changed) {
+      // render site again
+      this._render();
+    }
+    return changed;
   },
 
   /**
@@ -108,33 +117,145 @@ Site.prototype = {
     let control = this._querySelector(".newtab-control-pin");
 
     if (aPinned) {
-      control.setAttribute("pinned", true);
+      this.node.setAttribute("pinned", true);
       control.setAttribute("title", newTabString("unpin"));
     } else {
-      control.removeAttribute("pinned");
+      this.node.removeAttribute("pinned");
       control.setAttribute("title", newTabString("pin"));
     }
   },
 
+  _newTabString: function(str, substrArr) {
+    let regExp = /%[0-9]\$S/g;
+    let matches;
+    while ((matches = regExp.exec(str))) {
+      let match = matches[0];
+      let index = match.charAt(1); // Get the digit in the regExp.
+      str = str.replace(match, substrArr[index - 1]);
+    }
+    return str;
+  },
+
+  _getSuggestedTileExplanation: function() {
+    let targetedName = `<strong> ${this.link.targetedName} </strong>`;
+    let targetedSite = `<strong> ${this.link.targetedSite} </strong>`;
+    if (this.link.explanation) {
+      return this._newTabString(this.link.explanation, [targetedName, targetedSite]);
+    }
+    return newTabString("suggested.button", [targetedName]);
+  },
+
+  /**
+   * Checks for and modifies link at campaign end time
+   */
+  _checkLinkEndTime: function Site_checkLinkEndTime() {
+    if (this.link.endTime && this.link.endTime < Date.now()) {
+       let oldUrl = this.url;
+       // chop off the path part from url
+       this.link.url = Services.io.newURI(this.url, null, null).resolve("/");
+       // clear supplied images - this triggers thumbnail download for new url
+       delete this.link.imageURI;
+       delete this.link.enhancedImageURI;
+       // remove endTime to avoid further time checks
+       delete this.link.endTime;
+       // clear enhanced-content image that may still exist in preloaded page
+       this._querySelector(".enhanced-content").style.backgroundImage = "";
+       gPinnedLinks.replace(oldUrl, this.link);
+    }
+  },
+
   /**
    * Renders the site's data (fills the HTML fragment).
    */
   _render: function Site_render() {
+    // first check for end time, as it may modify the link
+    this._checkLinkEndTime();
+    // setup display variables
     let url = this.url;
-    let title = this.title || url;
-    let tooltip = (title == url ? title : title + "\n" + url);
+    let title = this.link.type == "history" ? this.link.baseDomain :
+                this.title;
+    let tooltip = (this.title == url ? this.title : this.title + "\n" + url);
 
     let link = this._querySelector(".newtab-link");
     link.setAttribute("title", tooltip);
     link.setAttribute("href", url);
-    this._querySelector(".newtab-title").textContent = title;
+    this.node.setAttribute("type", this.link.type);
+
+    let titleNode = this._querySelector(".newtab-title");
+    titleNode.textContent = title;
+    if (this.link.titleBgColor) {
+      titleNode.style.backgroundColor = this.link.titleBgColor;
+    }
 
     if (this.isPinned())
       this._updateAttributes(true);
+    // Capture the page if the thumbnail is missing, which will cause page.js
+    // to be notified and call our refreshThumbnail() method.
+    this.captureIfMissing();
+    // but still display whatever thumbnail might be available now.
+    this.refreshThumbnail();
+  },
+
+  /**
+   * Called when the site's tab becomes visible for the first time.
+   * Since the newtab may be preloaded long before it's displayed,
+   * check for changed conditions and re-render if needed
+   */
+  onFirstVisible: function Site_onFirstVisible() {
+    if (this.link.endTime && this.link.endTime < Date.now()) {
+      // site needs to change landing url and background image
+      this._render();
+    }
+    else {
+      this.captureIfMissing();
+    }
+  },
+
+  /**
+   * Captures the site's thumbnail in the background, but only if there's no
+   * existing thumbnail and the page allows background captures.
+   */
+  captureIfMissing: function Site_captureIfMissing() {
+    if (!document.hidden && !this.link.imageURI) {
+      BackgroundPageThumbs.captureIfMissing(this.url);
+    }
+  },
 
-    let thumbnailURL = PageThumbs.getThumbnailURL(this.url);
-    let thumbnail = this._querySelector(".newtab-thumbnail");
-    thumbnail.style.backgroundImage = "url(" + thumbnailURL + ")";
+  /**
+   * Refreshes the thumbnail for the site.
+   */
+  refreshThumbnail: function Site_refreshThumbnail() {
+    let link = this.link;
+
+    let thumbnail = this._querySelector(".newtab-thumbnail.thumbnail");
+    if (link.bgColor) {
+      thumbnail.style.backgroundColor = link.bgColor;
+    }
+    let uri = link.imageURI || PageThumbs.getThumbnailURL(this.url);
+    thumbnail.style.backgroundImage = 'url("' + uri + '")';
+
+    if (THUMBNAIL_PLACEHOLDER_ENABLED &&
+        link.type == "history" &&
+        link.baseDomain) {
+      let placeholder = this._querySelector(".newtab-thumbnail.placeholder");
+      let charCodeSum = 0;
+      for (let c of link.baseDomain) {
+        charCodeSum += c.charCodeAt(0);
+      }
+      const COLORS = 16;
+      let hue = Math.round((charCodeSum % COLORS) / COLORS * 360);
+      placeholder.style.backgroundColor = "hsl(" + hue + ",80%,40%)";
+      placeholder.textContent = link.baseDomain.substr(0,1).toUpperCase();
+    }
+  },
+
+  _ignoreHoverEvents: function(element) {
+    element.addEventListener("mouseover", () => {
+      this.cell.node.setAttribute("ignorehover", "true");
+    });
+    element.addEventListener("mouseout", () => {
+      this.cell.node.removeAttribute("ignorehover");
+    });
   },
 
   /**
@@ -145,10 +266,6 @@ Site.prototype = {
     this._node.addEventListener("dragstart", this, false);
     this._node.addEventListener("dragend", this, false);
     this._node.addEventListener("mouseover", this, false);
-
-    let controls = this.node.querySelectorAll(".newtab-control");
-    for (let i = 0; i < controls.length; i++)
-      controls[i].addEventListener("click", this, false);
   },
 
   /**
@@ -157,7 +274,75 @@ Site.prototype = {
   _speculativeConnect: function Site_speculativeConnect() {
     let sc = Services.io.QueryInterface(Ci.nsISpeculativeConnect);
     let uri = Services.io.newURI(this.url, null, null);
-    sc.speculativeConnect(uri, null);
+    try {
+      // This can throw for certain internal URLs, when they wind up in
+      // about:newtab. Be sure not to propagate the error.
+      sc.speculativeConnect(uri, null);
+    } catch (e) {}
+  },
+
+  /**
+   * Record interaction with site using telemetry.
+   */
+  _recordSiteClicked: function Site_recordSiteClicked(aIndex) {
+    if (Services.prefs.prefHasUserValue("browser.newtabpage.rows") ||
+        Services.prefs.prefHasUserValue("browser.newtabpage.columns") ||
+        aIndex > 8) {
+      // We only want to get indices for the default configuration, everything
+      // else goes in the same bucket.
+      aIndex = 9;
+    }
+    Services.telemetry.getHistogramById("NEWTAB_PAGE_SITE_CLICKED")
+                      .add(aIndex);
+  },
+
+  _toggleLegalText: function(buttonClass, explanationTextClass) {
+    let button = this._querySelector(buttonClass);
+    if (button.hasAttribute("active")) {
+      let explain = this._querySelector(explanationTextClass);
+      explain.parentNode.removeChild(explain);
+
+      button.removeAttribute("active");
+    }
+  },
+
+  /**
+   * Handles site click events.
+   */
+  onClick: function Site_onClick(aEvent) {
+    let action;
+    let pinned = this.isPinned();
+    let tileIndex = this.cell.index;
+    let {button, target} = aEvent;
+
+    // Handle tile/thumbnail link click
+    if (target.classList.contains("newtab-link") ||
+        target.parentElement.classList.contains("newtab-link")) {
+      // Record for primary and middle clicks
+      if (button == 0 || button == 1) {
+        this._recordSiteClicked(tileIndex);
+        action = "click";
+      }
+    }
+    // Only handle primary clicks for the remaining targets
+    else if (button == 0) {
+      aEvent.preventDefault();
+      if (target.classList.contains("newtab-control-block")) {
+        this.block();
+        action = "block";
+      }
+      else if (pinned && target.classList.contains("newtab-control-pin")) {
+        this.unpin();
+        action = "unpin";
+      }
+      else if (!pinned && target.classList.contains("newtab-control-pin")) {
+        if (this.pin()) {
+          // suggested link has changed - update rest of the pages
+          gAllPages.update(gPage);
+        }
+        action = "pin";
+      }
+    }
   },
 
   /**
@@ -165,15 +350,6 @@ Site.prototype = {
    */
   handleEvent: function Site_handleEvent(aEvent) {
     switch (aEvent.type) {
-      case "click":
-        aEvent.preventDefault();
-        if (aEvent.target.classList.contains("newtab-control-block"))
-          this.block();
-        else if (this.isPinned())
-          this.unpin();
-        else
-          this.pin();
-        break;
       case "mouseover":
         this._node.removeEventListener("mouseover", this, false);
         this._speculativeConnect();
@@ -181,9 +357,6 @@ Site.prototype = {
       case "dragstart":
         gDrag.start(this, aEvent);
         break;
-      case "drag":
-        gDrag.drag(this, aEvent);
-        break;
       case "dragend":
         gDrag.end(this, aEvent);
         break;
diff --git a/application/palemoon/base/content/newtab/transformations.js b/application/palemoon/base/content/newtab/transformations.js
index 978116182..f7db0ad84 100644
--- a/application/palemoon/base/content/newtab/transformations.js
+++ b/application/palemoon/base/content/newtab/transformations.js
@@ -156,7 +156,7 @@ var gTransformation = {
       finish();
     } else {
       this.setSitePosition(aSite, targetPosition);
-      this._whenTransitionEnded(aSite.node, finish);
+      this._whenTransitionEnded(aSite.node, ["left", "top"], finish);
     }
   },
 
@@ -181,13 +181,13 @@ var gTransformation = {
 
       batch.push(new Promise(resolve => {
         if (!cells[aIndex]) {
-        // The site disappeared from the grid, hide it.
+          // The site disappeared from the grid, hide it.
           this.hideSite(aSite, resolve);
         } else if (this._getNodeOpacity(aSite.node) != 1) {
-        // The site disappeared before but is now back, show it.
+          // The site disappeared before but is now back, show it.
           this.showSite(aSite, resolve);
         } else {
-        // The site's position has changed, move it around.
+          // The site's position has changed, move it around.
           this._moveSite(aSite, aIndex, {unfreeze: unfreeze, callback: resolve});
         }
       }));
@@ -202,15 +202,19 @@ var gTransformation = {
    * Listens for the 'transitionend' event on a given node and calls the given
    * callback.
    * @param aNode The node that is transitioned.
+   * @param aProperties The properties we'll wait to be transitioned.
    * @param aCallback The callback to call when finished.
    */
   _whenTransitionEnded:
-    function Transformation_whenTransitionEnded(aNode, aCallback) {
+    function Transformation_whenTransitionEnded(aNode, aProperties, aCallback) {
 
-    aNode.addEventListener("transitionend", function onEnd() {
-      aNode.removeEventListener("transitionend", onEnd, false);
-      aCallback();
-    }, false);
+    let props = new Set(aProperties);
+    aNode.addEventListener("transitionend", function onEnd(e) {
+      if (props.has(e.propertyName)) {
+        aNode.removeEventListener("transitionend", onEnd);
+        aCallback();
+      }
+    });
   },
 
   /**
@@ -236,8 +240,9 @@ var gTransformation = {
       if (aCallback)
         aCallback();
     } else {
-      if (aCallback)
-        this._whenTransitionEnded(aNode, aCallback);
+      if (aCallback) {
+        this._whenTransitionEnded(aNode, ["opacity"], aCallback);
+      }
 
       aNode.style.opacity = aOpacity;
     }
diff --git a/application/palemoon/base/content/utilityOverlay.js b/application/palemoon/base/content/utilityOverlay.js
index c4cd87f60..c45297e0b 100644
--- a/application/palemoon/base/content/utilityOverlay.js
+++ b/application/palemoon/base/content/utilityOverlay.js
@@ -328,6 +328,7 @@ function openLinkIn(url, where, params) {
   // result in a new frontmost window (e.g. "javascript:window.open('');").
   w.focus();
 
+  let browserUsedForLoad = null;
   switch (where) {
   case "current":
     let flags = Ci.nsIWebNavigation.LOAD_FLAGS_NONE;
@@ -346,27 +347,35 @@ function openLinkIn(url, where, params) {
                                 referrerPolicy: aReferrerPolicy,
                                 postData: aPostData,
                                 }); 
+    browserUsedForLoad = aCurrentBrowser;
     break;
   case "tabshifted":
     loadInBackground = !loadInBackground;
     // fall through
   case "tab":
     let browser = w.gBrowser;
-    browser.loadOneTab(url, {
-                       referrerURI: aReferrerURI,
-                       referrerPolicy: aReferrerPolicy,
-                       charset: aCharset,
-                       postData: aPostData,
-                       inBackground: loadInBackground,
-                       allowThirdPartyFixup: aAllowThirdPartyFixup,
-                       relatedToCurrent: aRelatedToCurrent});
+    let tabUsedForLoad = browser.loadOneTab(url, {
+                           referrerURI: aReferrerURI,
+                           referrerPolicy: aReferrerPolicy,
+                           charset: aCharset,
+                           postData: aPostData,
+                           inBackground: loadInBackground,
+                           allowThirdPartyFixup: aAllowThirdPartyFixup,
+                           relatedToCurrent: aRelatedToCurrent});
+    browserUsedForLoad = tabUsedForLoad.linkedBrowser;
     break;
   }
 
-  w.gBrowser.selectedBrowser.focus();
+  // Focus the content, but only if the browser used for the load is selected.
+  if (browserUsedForLoad &&
+      browserUsedForLoad == browserUsedForLoad.getTabBrowser().selectedBrowser) {
+    browserUsedForLoad.focus();
+  }
 
   if (!loadInBackground && w.isBlankPageURL(url))
-    w.focusAndSelectUrlBar();
+    if (!w.focusAndSelectUrlBar()) {
+      console.error("Unable to focus and select address bar.")
+    }
 }
 
 // Used as an onclick handler for UI elements with link-like behavior.