595862 - Overriding/replacing window icons from extension broken (at least for Thunderbird), documentation incorrect

Status: VERIFIED DUPLICATE of bug 543490

(Core :: Widget, defect)

Description

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

Attachment: test extension overrides icon of main application window

Windows XP SP3 32-bit
Firefox 3.6.9
Thunderbird 3.1.3

Documentation: https://developer.mozilla.org/en/Window_icons

Trying to override the window icon of the application according to the documentation with the attached extension.
Works for Firefox with main-window.ico
Works not for Thunderbird with messengerWindow.ico

Notice: "These icons will override the global icon files, which are located in app_dir/chrome/icons/default." This is incorrect as this directory doesn't exist in Firefox 3.6.9.