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
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