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

Wil Thunderbird work on Mac Sierra?

  • 3 cavab
  • 1 has this problem
  • 9 views
  • Last reply by christ1

more options

Downloaded Mac's new OS, Sierra, version 10.12. Thunderbird opens, but with a type font of enormous size and no toolbars. Seems unresponsive to any commands. I uninstalled Thunderbird, downloaded the latest version, installed it and same response.

Downloaded Mac's new OS, Sierra, version 10.12. Thunderbird opens, but with a type font of enormous size and no toolbars. Seems unresponsive to any commands. I uninstalled Thunderbird, downloaded the latest version, installed it and same response.

All Replies (3)

more options

This morning in the Thunderbird support newsgroup, I read that there are no known issues. This was posted by a reputable source.

more options

Okay, I respect that. I'm attaching a screenshot of Thunderbird after I open it in Mac Sierra. Might not be OS related, but Thunderbird was working fine before the upgrade. I did get a request during the OS install to download a font for Thunderbird, but I said okay and assumed the download of the font was a minor issue.

more options

Try to start Thunderbird in safe mode. https://support.mozilla.org/kb/safe-mode-thunderbird