Prior to running:
sudo apt-get purge --remove xul-ext-ubufox
I ran into constant crashes with both Mozilla® Firefox® 
48.0+build2-0ubuntu0.16.04.1 and 49.0+build4-0ubuntu0.16.04.1, extensions or no 
extensions.  This may be related to Bug 1612994 "firefox crashes constantly", 
but don't yet know (as of 15 October 2016) whether 1612994 can be 
satisfactorily marked a duplicate of this Bug.

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  Firefox 49+ multiprocess windows feature (e10s) is disabled by ubufox

Status in ubufox package in Ubuntu:

Bug description:
  Firefox 49+ enables e10s by default:

  But Ubuntu's "Ubuntu Modifications 3.2" extension disables it. In 
about:support output it says:

  "Multiprocess Windows 0/1 (Disabled by add-ons)"

  If we manually disable "Ubuntu Modifications" extension, it works:

  "Multiprocess Windows 1/1 (Enabled by default)"

  I am using Xubuntu 16.04, firefox 49.0+build4-0ubuntu0.16.04.1, 
xul-ext-ubufox 3.2-0ubuntu1.

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