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[Luke <1478173@xxxxxxxxxxxxxxxxxx>]

This may also affect libreoffice. See:
https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1527053
https://bugs.launchpad.net/ubuntu-themes/+bug/1527910

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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 One Hundred Papercuts:
  Confirmed
Status in Ubuntu theme:
  Confirmed
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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