Fix backspace to go back and forward on win32 (bug 207175). Patch (mostly) by noririty@jcom.home.ne.jp.

browser/base/content/browser.js

@@ -591,6 +591,29 @@ function BrowserBack()
   }
 }
 
+#ifdef XP_WIN
+function BrowserHandleBackspace()
+{
+  // The order of seeing keystrokes is this:
+  // 1) Chrome, 2) Typeahead, 3) [platform]HTMLBindings.xml
+  // Rather than have typeaheadfind responsible for making VK_BACK 
+  // go back in history, we handle backspace it here as follows:
+  // When backspace is pressed, it might mean back
+  // in typeaheadfind if that's active, or it might mean back in history
+
+  var typeAhead = null;
+  const TYPE_AHEAD_FIND_CONTRACTID = "@mozilla.org/typeaheadfind;1";
+  if (TYPE_AHEAD_FIND_CONTRACTID in Components.classes) {
+    typeAhead = Components.classes[TYPE_AHEAD_FIND_CONTRACTID]
+                .getService(Components.interfaces.nsITypeAheadFind);
+  }
+  
+  if (!typeAhead || !typeAhead.backOneChar()) {
+    BrowserBack();
+  }
+}
+#endif
+
 function BrowserForward()
 {
   try {

browser/base/content/browser.xul

@@ -103,6 +103,10 @@
     <command id="cmd_bm_paste"                     oncommand="goDoCommand('cmd_bm_paste');"/>
     <command id="cmd_bm_delete"                    oncommand="goDoCommand('cmd_bm_delete');"/>
 
+#ifdef XP_WIN
+    <command id="cmd_handleBackspace"  oncommand="BrowserHandleBackspace();" />
+#endif
+
     <command id="cmd_newNavigatorTab" oncommand="BrowserOpenTab();"/>
     <command id="Browser:OpenFile"  oncommand="BrowserOpenFileWindow();"/>
     <command id="Browser:SavePage" oncommand="saveDocument(window._content.document);"/>
@@ -216,7 +220,10 @@
     <key id="key_selectAll" key="&selectAllCmd.key;" modifiers="accel"/>
     <key id="goBackKb"  keycode="VK_LEFT" command="Browser:Back" modifiers="alt"/>
     <key id="goForwardKb"  keycode="VK_RIGHT" command="Browser:Forward" modifiers="alt"/>
-
+#ifdef XP_WIN
+    <key keycode="VK_BACK" command="cmd_handleBackspace"/>
+    <key keycode="VK_BACK" command="Browser:Forward" modifiers="shift"/>
+#endif
     <key keycode="VK_F5" oncommand="BrowserReload();"/>
     <key keycode="VK_F5" modifiers="control" oncommand="BrowserReloadSkipCache();"/>