Try to disable hardware acceleration in Firefox. *Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available" *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

Can't do that. Firefox will not open!

Got Firefox to open in safe mode. disabled hardware acceleration. Still no joy

If you have submitted crash reports then please post the IDs of one or more recent crash reports that have a "bp-" prefix: *bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx You can find the IDs of the submitted crash reports on the <i>about:crashes</i> page. *You can open the <b>about:crashes</b> page via the location bar, like you open a website, or open the crash reports page via "Help > Troubleshooting Information". See: *http://kb.mozillazine.org/Mozilla_Crash_Reporter *https://support.mozilla.org/kb/Mozilla+Crash+Reporter If you can't open Firefox, see: *http://kb.mozillazine.org/Mozilla_Crash_Reporter#Location_of_crash_reports *http://kb.mozillazine.org/Mozilla_Crash_Reporter#Viewing_crash_reports *https://developer.mozilla.org/How_to_get_a_stacktrace_for_a_bug_report ----- In Firefox Safe mode these changes are effective: *all extensions are disabled *default theme is used (no persona) *userChrome.css and userContent.css are ignored *default toolbar layout is used (localstore-safe.rdf) *Javascript JIT compilers are disabled (javascript.options.*jit) *hardware acceleration is disabled *plugins are not affected *preferences are not affected