We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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

uninstall update

  • 2 replies
  • 3 have this problem
  • 4 views
  • Last reply by Foxprints

more options

Update from 38.7.2 to 45.0 cause a compatibility problem with my email host & I can't download any messages, how can I uninstall the update?

Update from 38.7.2 to 45.0 cause a compatibility problem with my email host & I can't download any messages, how can I uninstall the update?

All Replies (2)

more options

Problems after update (such as what you describe) are typically caused by antivirus, and extensions installed into Thunderbird. Please start Thunderbird in safe mode https://support.mozilla.org/en-US/kb/safe-mode-thunderbird

Is the problem gone??

more options

I don't have any antivirus add ons or extensions