<SOLVED> Firefox Won't Open After Upgrade to Mint 19.1

[ablebaker]

Today I upgraded from 18.3 to 19.1 (Cinnamon) and then copied my home directory from an external hard drive to the new install, but now Firefox won’t open. A Profile Missing window appears with the message: “Your Firefox profile cannot be loaded. It may be missing or inaccessible.”

The .mozilla directory appears to have copied intact from my backup. I don't know how to proceed.

Help in getting Firefox working would be greatly appreciated!

[MrGrimm]

since you do have a backup first i would completely remove firefox and reinstall it. then let it run once without restoring your backup. then shut it down, go into your saved profile folder and copy everything from it, go to .mozilla/firefox/ open the profile folder there, delete everything and then paste what you copies from your saved profile into that folder. now firefox should launch just fine. if you still having the issue after this then others will have to weigh in, cause this always works for me rather it's linux or windows. same procedure i have followed for all browsers for years.

[ablebaker]

Thank you MrGrimm for your reply. Before I saw your response, I solved this by deleting the profiles.ini file and moving the .default directory once again from the backup drive. All bookmarks and settings seem to have made the transition satisfactorily. I think this approach is essentially what you've suggested too.

I've no idea why it worked this time and not the first time I copied all data from the backup.

Thanks again for your help.

[MrGrimm]

you're welcome