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+# Overview
+
+The RDM tool uses several forms of tab and browser swapping to integrate the
+tool UI cleanly into the browser UI.  The high level steps of this process are
+documented at `/devtools/docs/responsive-design-mode.md`.
+
+This document contains a random assortment of low level notes about the steps
+the browser goes through when swapping browsers between tabs.
+
+# Connections between Browsers and Tabs
+
+Link between tab and browser (`gBrowser._linkBrowserToTab`):
+
+```
+aTab.linkedBrowser = browser;
+gBrowser._tabForBrowser.set(browser, aTab);
+```
+
+# Swapping Browsers between Tabs
+
+## Legend
+
+* (R): remote browsers only
+* (!R): non-remote browsers only
+
+## Functions Called
+
+When you call `gBrowser.swapBrowsersAndCloseOther` to move tab content from a
+browser in one tab to a browser in another tab, here are all the code paths
+involved:
+
+* `gBrowser.swapBrowsersAndCloseOther`
+  * `gBrowser._beginRemoveTab`
+    * `gBrowser.tabContainer.updateVisibility`
+    * Emit `TabClose`
+    * `browser.webProgress.removeProgressListener`
+    * `filter.removeProgressListener`
+    * `listener.destroy`
+  * `gBrowser._swapBrowserDocShells`
+    * `ourBrowser.webProgress.removeProgressListener`
+    * `filter.removeProgressListener`
+    * `gBrowser._swapRegisteredOpenURIs`
+    * `ourBrowser.swapDocShells(aOtherBrowser)`
+      * Emit `SwapDocShells`
+      * `PopupNotifications._swapBrowserNotifications`
+      * `browser.detachFormFill` (!R)
+      * `browser.swapFrameLoaders`
+      * `browser.attachFormFill` (!R)
+      * `browser._remoteWebNavigationImpl.swapBrowser(browser)` (R)
+      * `browser._remoteWebProgressManager.swapBrowser(browser)` (R)
+      * `browser._remoteFinder.swapBrowser(browser)` (R)
+      * Emit `EndSwapDocShells`
+    * `gBrowser.mTabProgressListener`
+    * `filter.addProgressListener`
+    * `ourBrowser.webProgress.addProgressListener`
+  * `gBrowser._endRemoveTab`
+    * `gBrowser.tabContainer._fillTrailingGap`
+    * `gBrowser._blurTab`
+    * `gBrowser._tabFilters.delete`
+    * `gBrowser._tabListeners.delete`
+    * `gBrowser._outerWindowIDBrowserMap.delete`
+    * `browser.destroy`
+    * `gBrowser.tabContainer.removeChild`
+    * `gBrowser.tabContainer.adjustTabstrip`
+    * `gBrowser.tabContainer._setPositionalAttributes`
+    * `browser.parentNode.removeChild(browser)`
+    * `gBrowser._tabForBrowser.delete`
+    * `gBrowser.mPanelContainer.removeChild`
+  * `gBrowser.setTabTitle` / `gBrowser.setTabTitleLoading`
+    * `browser.currentURI.spec`
+    * `gBrowser._tabAttrModified`
+    * `gBrowser.updateTitlebar`
+  * `gBrowser.updateCurrentBrowser`
+    * `browser.docShellIsActive` (!R)
+    * `gBrowser.showTab`
+    * `gBrowser._appendStatusPanel`
+    * `gBrowser._callProgressListeners` with `onLocationChange`
+    * `gBrowser._callProgressListeners` with `onSecurityChange`
+    * `gBrowser._callProgressListeners` with `onUpdateCurrentBrowser`
+    * `gBrowser._recordTabAccess`
+    * `gBrowser.updateTitlebar`
+    * `gBrowser._callProgressListeners` with `onStateChange`
+    * `gBrowser._setCloseKeyState`
+    * Emit `TabSelect`
+    * `gBrowser._tabAttrModified`
+    * `browser.getInPermitUnload`
+    * `gBrowser.tabContainer._setPositionalAttributes`
+  * `gBrowser._tabAttrModified`
+
+## Browser State
+
+When calling `gBrowser.swapBrowsersAndCloseOther`, the browser is not actually
+moved from one tab to the other.  Instead, various properties _on_ each of the
+browsers are swapped.
+
+Browser attributes `gBrowser.swapBrowsersAndCloseOther` transfers between
+browsers:
+
+* `usercontextid`
+
+Tab attributes `gBrowser.swapBrowsersAndCloseOther` transfers between tabs:
+
+* `usercontextid`
+* `muted`
+* `soundplaying`
+* `busy`
+
+Browser properties `gBrowser.swapBrowsersAndCloseOther` transfers between
+browsers:
+
+* `mIconURL`
+* `getFindBar(aOurTab)._findField.value`
+
+Browser properties `gBrowser._swapBrowserDocShells` transfers between browsers:
+
+* `outerWindowID` in `gBrowser._outerWindowIDBrowserMap`
+* `_outerWindowID` on the browser (R)
+* `docShellIsActive`
+* `permanentKey`
+* `registeredOpenURI`
+
+Browser properties `browser.swapDocShells` transfers between browsers:
+
+* `_docShell`
+* `_webBrowserFind`
+* `_contentWindow`
+* `_webNavigation`
+* `_remoteWebNavigation` (R)
+* `_remoteWebNavigationImpl` (R)
+* `_remoteWebProgressManager` (R)
+* `_remoteWebProgress` (R)
+* `_remoteFinder` (R)
+* `_securityUI` (R)
+* `_documentURI` (R)
+* `_documentContentType` (R)
+* `_contentTitle` (R)
+* `_characterSet` (R)
+* `_contentPrincipal` (R)
+* `_imageDocument` (R)
+* `_fullZoom` (R)
+* `_textZoom` (R)
+* `_isSyntheticDocument` (R)
+* `_innerWindowID` (R)
+* `_manifestURI` (R)
+
+`browser.swapFrameLoaders` swaps the actual page content.