[Bug 1580168] [NEW] Tab descriptions are unreadable, black text on black background

[Aki Ketolainen]

Public bug reported:

When I hover the mouse button on top of the Firefox tabs, the tab descriptions are
unreadable, black text on black background. 

This also happens on some other web sites which pop up a description
box, e.g. on portal.azure.com when hovering over your username in the
top right corner in the browser.

This probably started happening when Firefox was first compiled against gtk3.
My gtk3 theme is oxygen-gtk.

1) The Ubuntu release is 14.04.4
2) The version of Firefox is 46.0+build5-0ubuntu0.14.04.2
3) I expect to be able to read the tab descriptions
4) The tab descriptions are black text on black background

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

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Title:
  Tab descriptions are unreadable, black text on black background

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