Crashes on startup after the update to Firefox 46 on OS X

Some users on OS X who have the potentially unwanted software PremierOpinion present on their system and hooking into the browser, will experience Firefox consistently crashing at startup after the update to Firefox 46. bold text Affected users should perform a scan for malware with an external tool like the free version of Malwarebytes Anti-Malware for Mac or follow a manual removal guide to get rid of PremierOpinion: http://www.thesafemac.com/arg-premier-opinion/

If you need further assistence or having problems with a different crash, you can refer to Troubleshoot Firefox crashes (closing or quitting unexpectedly).