I am not sure what you see here. Possibly you have a device that crashes and it is synced with your current device so you are blaming the Sync presumably because of a Synced Addon #Try starting in Firefox's Safe Mode for instance by holding the Shift Key as Firefox starts up #* [[Troubleshoot Firefox issues using Safe Mode]] #Use Firefox Sync settings to turn of the Sync feature without resetting Sync #* [[How do I choose what types of information to sync on Firefox?]] # If you have a problem addon disable or remove it #* [[Disable or remove Add-ons]] Please post back to say how you get on and whether you need further help.