By 'crash' I presume you mean Thunderbird suddenly closes. Exit thunderbird if open. * Start computer in ''''Safe Mode with Networking'''' * Start Thunderbird in Thunderbird ''''Safe Mode'''' Info on how to start Thunderbird in Safe mode.' * https://support.mozilla.org/en-US/kb/safe-mode-thunderbird Does everything work ok in computer 'Safe mode with Networking' and 'Thunderbird in 'SAfe Mode' ? If yes: Exit Thunderbird Restart Thunderbird as normal. Does everything work ok in computer 'Safe mode with Networking' and 'Thunderbird in Normal mode? What Operating system are you using? What version of Thunderbird are you using? Have you recently updated your OS ? Have you recently updated Thunderbird?

Also please see https://support.mozilla.org/en-US/kb/mozilla-crash-reporter-tb#w_viewing-crash-reports and post your crash IDs here in this topic