Everytime I try to use Firefox Sync, Firefox crashes. After enabling Sync firefox crashes at every start. It does not crash in safe mode. How to avoid Sync to cause crashing firefox?
crash report: https://crash-stats.mozilla.com/report/index/2d3084bf-e2fb-4554-b1ec-4905e2131221
I think the crash happen because of your addons, check your addons are uptodate!
Remove the unwanted addons
They are all up to date. So should I disable all and enable one by one and try again?
The problem is, that i cannot start firefox anymore (but in safe mode), because it instantly crashes.
Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
Profile Backup and Restore