Hello,

Try to reset Firefox go Here

Bye

Hi sdc93, sorry to hear about this problem. Did it just start with the latest update?

If you haen't already, could you try starting Firefox in its "Safe Mode" by holding down the option/alt key on the keyboard while start it?

Sorry, but Firefox in Safe Mode it also closes after a few seconds

Hi sdc93, does the crash report have the same "signature" when you click through to it? If there are more IDs to share, that could be helpful. The original report has a very "rare" signature that is Mac-specific (which I probably cannot help with).

https://crash-stats.mozilla.com/signature/?product=Firefox&signature=libFontParser.dylib%400x1ea3&date=%3E%3D2019-04-22T17%3A52%3A00.000Z&date=%3C2019-05-06T17%3A52%3A00.000Z&_columns=date&_columns=product&_columns=version&_columns=build_id&_columns=platform&_columns=reason&_columns=address&_columns=install_time&_columns=startup_crash&_sort=-date&page=1

You can check in Font Book for font issues like corrupted and duplicate fonts.

You can try to do some maintenance and cleanup.

• OnyX
  https://www.titanium-software.fr/en/onyx.html
• https://appletoolbox.com/2016/07/fix-corrupt-user-accounts-macos/