this seems to be a Firefox bug that should be fixed in Firefox 50:

** Bug watch added: Mozilla Bugzilla #1266914

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Touch seeded packages, which is subscribed to ubuntu-themes in Ubuntu.

  Firefox search and location boxes have black borders when unselected

Status in ubuntu-mate-artwork package in Ubuntu:
  Fix Released
Status in ubuntu-themes package in Ubuntu:
  In Progress

Bug description:

  As seen in the attached screen shot the borders around Firefox
  location and search entry boxes are black when unselected, but they
  should be grey.

  The black borders are inconsistent with the rest of the Ubuntu theming
  and it looks jarring.

  The issue is resolved by styling the 'frame' selector, which Firefox
  uses to style the Search and Location entry boxes. Some overrides are
  then applied to prevent frames incorrectly rendering borders in other

  [Test Case]

  To observe the issue simply open Firefox and look at the Search or
  Location entry boxes while they are unselected, the borders will be

  After installing the patched theme doing to same will result in the
  borders being rendered using an appropriate shade of grey.

  [Regression Potential]

  It is possible that some GTK3+ applications may now render frames with
  a border where they previously did not. That said, the default
  applications in Ubuntu have been checked for this regression and the
  appropriate overrides have been added.

  The default installed applications in Ubuntu have been tested to
  ensure they do not regress in the manner described above.

  [Other Info]
  Should Firefox style the Search and Location entry boxes with a discrete 
selector in the future then the styling added to work around the black border 
could be removed/updated.

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