[Bug 1500395] [NEW] latest update breaks user CSS / Accessibility settings

[JVD]

Public bug reported:

After the update to firefox 41.0+build3-0ubuntu0.14.04.1 was applied
on my x86_64 14.04.3 LTS system,  the firefox 'about:' internal URL dialogs
displayed in white text on a white background .
This now includes dialogs like the "Preferences" / "Menu" dialogs. 
So effectively it renders the whole browser's menu system unusable
if you have selected the : about:preferences#content :
     Preferences -> Colors -> "Override the colors specified by my selections above"
to be "Always" and you specify a dark background color (eg #202020) and a light
text color (eg #ffffff ) then all the menus are in white text and white background.

The previous firefox version correctly applied my "Override Colors Always" setting to the 
"about:*"  internal dialogs .

How can I get this behaviour back ?

Under KDE / Qt, ALL other applications correctly display in white text
on black background .

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: firefox (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1500395

Title:
  latest update breaks user CSS / Accessibility settings

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