Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

Can no longer log in!

  • 1 reply
  • 2 have this problem
  • 1 view
  • Last reply by Toad-Hall

more options

Upgraded to Windows 10 and now cannot log into Thunderbird. Get message to enter master password, but will not accept it.

Upgraded to Windows 10 and now cannot log into Thunderbird. Get message to enter master password, but will not accept it.

All Replies (1)

more options

I presume you set up a 'Master Password'. here is some info on how to remove it. Be aware that it will remove all passwords.