885746 - JS error in LWT code when leaving customization mode

Status: RESOLVED DUPLICATE of bug 884120

(Firefox :: Toolbars and Customization, defect)

Description

[Mike de Boer [:mikedeboer]]

STR:

1. Go into Customization Mode on Mac OSX UX Nightly, without any LWT applied
2. Leave Customization mode
3. Check your console to find the following error:

************************************************************
* Call to xpconnect wrapped JSObject produced this error:  *
[Exception... "'[JavaScript Error: "themeData is null" {file: "chrome://browser/content/browser.js" line: 616}]' when calling method: [nsIObserver::observe]"  nsresult: "0x80570021 (NS_ERROR_XPC_JAVASCRIPT_ERROR_WITH_DETAILS)"  location: "JS frame :: resource://gre/modules/LightweightThemeManager.jsm :: _notifyWindows :: line 713"  data: yes]
************************************************************

I also noticed a visual artifact left behind in the titlebar that disappears when I hover it with my mouse.

Comment 1

[Mike de Boer [:mikedeboer]]

Attachment: Showing the glitch/ artifact