This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Thunderbird 102.4.1 hangs at startup, 120% CPU, unusable

  • 3 replies
  • 0 have this problem
  • 9 views
  • Last reply by marcus37

more options

Hello,

15+ year Thunderbird user. Six email accounts and more than a decade of emails. Starting today, changing nothing (to my knowledge), Thunderbird will not open even far enough to show an inbox. It immediately hangs and my hard drive goes wild. The Activity Monitor App showed as high as 121% CPU usage. MacBook Pro (2016) OS High Sierra 10.13.6. After multiple web searches, I have uninstalled Firefox (no dice), and done a fresh install of Thunderbird (twice. no dice). I also updated (after these issues, in an attempt to fix them) from OS Sierra to High Sierra (no dice). I most certainly don't have the time or willpower to build a new profile and move everything. So, if I can't rectify this simply and quickly, I'll just move on. However, I really just want it fixed. Thank you.

Hello, 15+ year Thunderbird user. Six email accounts and more than a decade of emails. Starting today, changing nothing (to my knowledge), Thunderbird will not open even far enough to show an inbox. It immediately hangs and my hard drive goes wild. The Activity Monitor App showed as high as 121% CPU usage. MacBook Pro (2016) OS High Sierra 10.13.6. After multiple web searches, I have uninstalled Firefox (no dice), and done a fresh install of Thunderbird (twice. no dice). I also updated (after these issues, in an attempt to fix them) from OS Sierra to High Sierra (no dice). I most certainly don't have the time or willpower to build a new profile and move everything. So, if I can't rectify this simply and quickly, I'll just move on. However, I really just want it fixed. Thank you.

All Replies (3)

more options

I've just disabled all add-ons, and it works fine. So, I just need to figure out which one is the problem, and what, if anything changed. Thank you.

more options

Google Calendar, but I'm still using with all disabled, until a need arises for a different one.