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[Jared Sot <1478173@xxxxxxxxxxxxxxxxxx>]

I have not had a change to test this on older Ubuntus with the new
nightly firefox yet but I can confirm this is a issue with 15.04 & 15.10
. And since  when this hits in the latest firefox (that will be shipped
on nearly all supported Ubuntu builds) this fix may need to be tested
and applied to older and newer builds of Ambaince Themes (EG one in
14.04 , 12.04 etc.) I am not sure yet however.

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https://bugs.launchpad.net/bugs/1478173

Title:
  Ambiance & Radiance themes are missing a "background-color" for
  tooltip elements (needed for GTK3-enabled Firefox Nightly)

Status in ubuntu-themes package in Ubuntu:
  Confirmed

Bug description:
  Firefox Nightlies recently became GTK3-enabled, and that uncovered an
  issue with Ubuntu's Ambiance & Radiance GTK3 themes.

  They're missing a "background-color" for the .tooltip {...} CSS rule
  in their config files. They have a "tooltip_bg_color" variable, which
  they use to set up a background-image (really a gradient), but there's
  no background-color.

  This causes problems for GTK3-enabled Firefox, because it reads back some system-colors by setting up a dummy tooltip and reading the (currently-not-useful) background-color and the foreground-color. Right now, this produces unreadable output (for the user) with white-text-on-a-white-background, as shown in this screenshot:
   https://bug1187203.bmoattachments.org/attachment.cgi?id=8638351

  The solution is simple -- just add this one line to the ".tooltip" CSS rule in gtk-widgets.css:
     background-color: @tooltip_bg_color;

  For more details, see bug
  https://bugzilla.mozilla.org/show_bug.cgi?id=1187203

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: light-themes 14.04+15.04.20150410-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-23.24-generic 3.19.8-ckt2
  Uname: Linux 3.19.0-23-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Fri Jul 24 17:35:25 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-05-18 (67 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: all
  SourcePackage: ubuntu-themes
  UpgradeStatus: No upgrade log present (probably fresh install)

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