https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202165

Jan Beich <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #5 from Jan Beich <[email protected]> ---
(In reply to rsmith from comment #4)
> Maybe it's just me, but firefox 40 seems to be relatively
> unstable. It has now hung and crashed four times in less than a
> day. I'm going back to 39 for the time being.

Do you use GTK2 or GTK3? Anyway, try setting the following preference in
about:config:

  layers.offmainthreadcomposition.enabled -> false

Per 40.0 relnotes it was enabled for

  Improved scrolling, graphics, and video playback performance with
  off main thread compositing (GNU/Linux only)

Otherwise, with nvidia-driver OMTC may work better with these

  gfx.xrender.enabled -> false
  layers.acceleration.force-enabled -> true

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