3 files changed, 6 insertions, 44 deletions
diff --git a/toolkit/components/thumbnails/BackgroundPageThumbs.jsm b/toolkit/components/thumbnails/BackgroundPageThumbs.jsm
index 3eec9827d..3ed32665d 100644
--- a/toolkit/components/thumbnails/BackgroundPageThumbs.jsm
+++ b/toolkit/components/thumbnails/BackgroundPageThumbs.jsm
@@ -15,8 +15,6 @@ const TELEMETRY_HISTOGRAM_ID_PREFIX = "FX_THUMBNAILS_BG_";
 const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
 const HTML_NS = "http://www.w3.org/1999/xhtml";
 
-const ABOUT_NEWTAB_SEGREGATION_PREF = "privacy.usercontext.about_newtab_segregation.enabled";
-
 const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
 
 Cu.import("resource://gre/modules/XPCOMUtils.jsm", this);
@@ -37,10 +35,11 @@ XPCOMUtils.defineConstant(this, "TEL_CAPTURE_DONE_TIMEOUT", TEL_CAPTURE_DONE_TIM
 XPCOMUtils.defineConstant(this, "TEL_CAPTURE_DONE_CRASHED", TEL_CAPTURE_DONE_CRASHED);
 XPCOMUtils.defineConstant(this, "TEL_CAPTURE_DONE_BAD_URI", TEL_CAPTURE_DONE_BAD_URI);
 
-XPCOMUtils.defineLazyModuleGetter(this, "ContextualIdentityService",
-                                  "resource://gre/modules/ContextualIdentityService.jsm");
 const global = this;
 
+// contains base64 version of a placeholder thumbnail
+#include blankthumb.inc
+
 const BackgroundPageThumbs = {
 
   /**
@@ -136,14 +135,6 @@ const BackgroundPageThumbs = {
   }),
 
   /**
-   * Tell the service that the thumbnail browser should be recreated at next
-   * call of _ensureBrowser().
-   */
-  renewThumbnailBrowser: function() {
-    this._renewThumbBrowser = true;
-  },
-
-  /**
    * Ensures that initialization of the thumbnail browser's parent window has
    * begun.
    *
@@ -198,12 +189,9 @@ const BackgroundPageThumbs = {
    * Creates the thumbnail browser if it doesn't already exist.
    */
   _ensureBrowser: function () {
-    if (this._thumbBrowser && !this._renewThumbBrowser)
+    if (this._thumbBrowser)
       return;
 
-    this._destroyBrowser();
-    this._renewThumbBrowser = false;
-
     let browser = this._parentWin.document.createElementNS(XUL_NS, "browser");
     browser.setAttribute("type", "content");
     browser.setAttribute("disableglobalhistory", "true");
@@ -213,13 +201,6 @@ const BackgroundPageThumbs = {
       browser.setAttribute("remote", "true");
     }
 
-    if (Services.prefs.getBoolPref(ABOUT_NEWTAB_SEGREGATION_PREF)) {
-      // Use the private container for thumbnails.
-      let privateIdentity =
-        ContextualIdentityService.getPrivateIdentity("userContextIdInternal.thumbnail");
-      browser.setAttribute("usercontextid", privateIdentity.userContextId);
-    }
-
     // Size the browser.  Make its aspect ratio the same as the canvases' that
     // the thumbnails are drawn into; the canvases' aspect ratio is the same as
     // the screen's, so use that.  Aim for a size in the ballpark of 1024x768.
@@ -322,14 +303,6 @@ const BackgroundPageThumbs = {
   _destroyBrowserTimeout: DESTROY_BROWSER_TIMEOUT,
 };
 
-Services.prefs.addObserver(ABOUT_NEWTAB_SEGREGATION_PREF,
-  function(aSubject, aTopic, aData) {
-    if (aTopic == "nsPref:changed" && aData == ABOUT_NEWTAB_SEGREGATION_PREF) {
-      BackgroundPageThumbs.renewThumbnailBrowser();
-    }
-  },
-  false);
-
 Object.defineProperty(this, "BackgroundPageThumbs", {
   value: BackgroundPageThumbs,
   enumerable: true,
@@ -464,14 +437,6 @@ Capture.prototype = {
           Cu.reportError(err);
         }
       }
-
-      if (Services.prefs.getBoolPref(ABOUT_NEWTAB_SEGREGATION_PREF)) {
-        // Clear the data in the private container for thumbnails.
-        let privateIdentity =
-          ContextualIdentityService.getPrivateIdentity("userContextIdInternal.thumbnail");
-        Services.obs.notifyObservers(null, "clear-origin-attributes-data",
-          JSON.stringify({ userContextId: privateIdentity.userContextId }));
-      }
     };
 
     if (!data) {
diff --git a/toolkit/components/thumbnails/PageThumbs.jsm b/toolkit/components/thumbnails/PageThumbs.jsm
index 5c7754b31..b0affee92 100644
--- a/toolkit/components/thumbnails/PageThumbs.jsm
+++ b/toolkit/components/thumbnails/PageThumbs.jsm
@@ -28,9 +28,6 @@ const MAX_THUMBNAIL_AGE_SECS = 172800; // 2 days == 60*60*24*2 == 172800 secs.
  */
 const THUMBNAIL_DIRECTORY = "thumbnails";
 
-// contains base64 version of a placeholder thumbnail
-#include blankthumb.inc
-
 Cu.import("resource://gre/modules/XPCOMUtils.jsm", this);
 Cu.import("resource://gre/modules/PromiseWorker.jsm", this);
 Cu.import("resource://gre/modules/Promise.jsm", this);
diff --git a/toolkit/components/thumbnails/moz.build b/toolkit/components/thumbnails/moz.build
index d4003c635..e4a178998 100644
--- a/toolkit/components/thumbnails/moz.build
+++ b/toolkit/components/thumbnails/moz.build
@@ -13,13 +13,13 @@ EXTRA_COMPONENTS += [
 ]
 
 EXTRA_JS_MODULES += [
-    'BackgroundPageThumbs.jsm',
+    'PageThumbs.jsm',
     'PageThumbsWorker.js',
     'PageThumbUtils.jsm',
 ]
 
 EXTRA_PP_JS_MODULES += [
-    'PageThumbs.jsm',
+    'BackgroundPageThumbs.jsm',
 ]