Here's my Stylish style for fixing the dark StatusPanel (the mouse over
   pop up at the bottom of the Firefox browser window).
@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

.statuspanel-label {
  background: #666666 !important;
  color: #DDDDDD !important;
}

   Create a new style, name it what you want, and paste in the above.

   I will flesh this out more later.
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   My original entry is here: [1]Fix Firefox StatusPanel Colors in Ubuntu.
   It posted Wed, 05 Dec 2012 21:51:19 +0000.
   Filed under: technology, addon, firefox, style, stylish,

References

   1. https://www.prjorgensen.com/2012/12/05/fix-firefox-statuspanel-colors-in-ubuntu/