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.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

After an update last week, neither Thunderbird or Firefox will open. Thanks for the update!

Danielbugs
Danielbugs
more options

I don't remember wheher it was an update of Thunderbird or of Firefox, but it was one or the other. After the update occurred, neither of these programs has opened on my computer. I am using Internet Explorer now to access the Internet.

I don't remember wheher it was an update of Thunderbird or of Firefox, but it was one or the other. After the update occurred, neither of these programs has opened on my computer. I am using Internet Explorer now to access the Internet.

All Replies (1)

David McRitchie
David McRitchie
more options

see http://kb.mozillazine.org/Firewalls