Sorry to hear about the crashes and thank you for the report. The "mmhk" program that shows up in the crash report just before Firefox crashes is associated with a program that many consider unwanted software. Could you check whether you have it: These are the company's removal instructions for Mac -- I don't know how reliable they are: '''Option 1''' <ol> <li>Quit Firefox browsers for all user accounts on the machine.</li> <li>In Finder, select Applications, then PremierOpinion.</li> <li>Click on PremierOpinionUninstall.app. A window will appear asking you to enter a name and password to add a new helper tool.</li> <li>Use an Administrator user name and password and select Add Helper.</li> <li>Once Add Helper is clicked, the software is removed.</li></ol> '''Option 2''' <ol> <li>Quit all Firefox browsers for all user accounts on the machine.</li> <li>Locate the PremierOpinion folder in the Applications directory.</li> <li>Drag the PremierOpinion folder to the Trash.</li> <li>Enter the administrator name and password, then click "ok" to complete uninstall.</li></ol> Other resources: * [http://www.thesafemac.com/arg-premier-opinion/ The Safe Mac » Adware Removal Guide : Premier Opinion] * [https://malwaretips.com/blogs/premieropinion-removal/ Remove PremierOpinion Ads from Mac OS X and Windows]

Hi Instrumentalist, did this solution work for you or does the problem continue?