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

Default HTML Viewer in Thunderbird - Can Not Change After Latest Update

  • 2
  • 0
  • 1 view
  • Nzaghachi ikpeazụ nke TQinOH

more options

The default HTML viewer in Thunderbird 115.7.0 (as of 24 Jan 2024) changed from Microsoft Edge to Mozilla FireFox 122.0 after an earlier Thunderbird update several days ago.

I went to Tools | Settings | General | Files & Attachments to change the HTML Content Type "Action" back to Microsoft Edge. There was no change to the setting. I then selected "Delete Action" to remove the HTML entry from the list. However, I can't add the HTML entry back into the list.

How do I add "HTML" back to the "Content Type" list and then select the HTML viewer that I want?

The default HTML viewer in Thunderbird 115.7.0 (as of 24 Jan 2024) changed from Microsoft Edge to Mozilla FireFox 122.0 after an earlier Thunderbird update several days ago. I went to Tools | Settings | General | Files & Attachments to change the HTML Content Type "Action" back to Microsoft Edge. There was no change to the setting. I then selected "Delete Action" to remove the HTML entry from the list. However, I can't add the HTML entry back into the list. How do I add "HTML" back to the "Content Type" list and then select the HTML viewer that I want?

All Replies (2)

more options

Asịsa Ahọpụtara

more options

The Microsoft Edge browser default setting was changed by an unidentified process. Setting the default back solved the issue. Thank you.