Bug 1070988 - Windows installer should remove leftover chrome.manifest on pave over install to prevent startup crash with Firefox 32 and above with unpacked omni.ja. r=tabraldes

browser/installer/windows/nsis/shared.nsh

@@ -1008,6 +1008,14 @@ FunctionEnd
 
 ; Removes various directories and files for reasons noted below.
 !macro RemoveDeprecatedFiles
+  ; Some users are ending up with unpacked chrome instead of omni.ja. This
+  ; causes Firefox to break badly after upgrading from Firefox 31, see bug
+  ; 1063052. Removing the chrome.manifest from the install directory causes
+  ; Firefox to use the updated omni.ja so it won't crash.
+  ${If} ${FileExists} "$INSTDIR\chrome.manifest"
+    Delete "$INSTDIR\chrome.manifest"
+  ${EndIf}
+
   ; Remove talkback if it is present (remove after bug 386760 is fixed)
   ${If} ${FileExists} "$INSTDIR\extensions\talkback@mozilla.org"
     RmDir /r /REBOOTOK "$INSTDIR\extensions\talkback@mozilla.org"