Mozilla Thunderbird doesn't start with Bitdefender Free Edition on

I am using a freshly installed system Windows 10 Professionnel x64 Fr

Bitdefender Antivirus Free edition, Engine version 7.86614

Mozilla Thunderbird 78.5.0 (x64fr) same problem with previous release 78.4

Mozilla Thunderbird doesn't start - no error message

even in safe mode, no module activated, new empty profile

in Bitdefender, I added Exclusions for thunderbird.exe and profile directory

The only way to start Thunderbird is to set "Protection Shield" to Off in Bitdefender

Does anybody know what to do to solve this proble ?


  • Did you have a fix on this issue? I have the same problem with Facing same issue but no response from anyone and couldnt find this topic troubleshooting in google Wendy’s Survey

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