User Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0 Build ID: 20170518000419 Steps to reproduce: Can't always repro Actual results: Have to wait 3 minutes for app to unfreeze. Expected results: Unfreezes after 3 min. Using Windows 8. Running in compatibility mode for Windows 7.
Ken, Please start *Windows'* safe mode with networking enabled - win8 https://support.microsoft.com/en-us/help/17076/windows-8-startup-settings-safe-mode Still In Windows safe mode, start thunderbird in safe mode - https://support.mozilla.org/kb/safe-mode-thunderbird Does problem go away? (Joe has been seeing startup freeze in 55 beta)
I heard of safe mode, but don't know how to start it. Doesn't that mess up the appearance of your graphics?
I gave you links with instructions. Safe mode is temporary.
Can't proceed without more input from user