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

Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

File type HTML document (text/html) is not supported / Wrong file type association

  • 4 fhreagra
  • 0 leis an bhfadhb seo
  • 1 view
  • Freagra is déanaí ó David Booth

David Booth
David Booth
more options

Thunderbird 102.4.2 (64-bit) on Ubuntu 20.04

When I try to open an HTML file attachment, it tries to open it with "Document Viewer" and fails with the error message: "Unable to open document . . . File type HTML document (text/html) is not supported".

It seems like the file type association is wrong, because "Document Viewer" is a PDF viewer -- not an HTML browser. But I have been unable to find where TB defines its file type associations, to have it use Firefox instead of "Document Viewer". This issue says: https://support.mozilla.org/en-US/questions/1325496 [[ 

    Menu app icon > Options > General
   scroll down to 'Files & Attachments' section

]] but I do not know what "Menu app icon" means, and I do not find any such option section when I search the options from the Edit->Settings menu.

Where can I find Thunderbird's file type associations to fix this problem? Or is there some other fix needed?

Thunderbird 102.4.2 (64-bit) on Ubuntu 20.04 When I try to open an HTML file attachment, it tries to open it with "Document Viewer" and fails with the error message: "Unable to open document . . . File type HTML document (text/html) is not supported". It seems like the file type association is wrong, because "Document Viewer" is a PDF viewer -- not an HTML browser. But I have been unable to find where TB defines its file type associations, to have it use Firefox instead of "Document Viewer". This issue says: https://support.mozilla.org/en-US/questions/1325496 [[ Menu app icon > Options > General scroll down to 'Files & Attachments' section ]] but I do not know what "Menu app icon" means, and I do not find any such option section when I search the options from the Edit->Settings menu. Where can I find Thunderbird's file type associations to fix this problem? Or is there some other fix needed?
Attached screenshots

Réiteach roghnaithe

I believe that is at edit>settings>General.

Read this answer in context 👍 1

All Replies (4)

david
david
  • Top 10 Contributor
more options

Réiteach Roghnaithe

I believe that is at edit>settings>General.

David Booth
David Booth Úinéir na ceiste
more options

OMG, you are right! I was unable to find it because the "Search" feature does not work correctly. As you can see in the attached screenshot, it is not shown when searching the options for "attach".

I will file a separate bug report on that.

david
david
  • Top 10 Contributor
more options

What bug? Search feature is intended for content, not Thunderbird functions.

David Booth
David Booth Úinéir na ceiste
more options

david said
What bug? Search feature is intended for content, not Thunderbird functions.

That is not correct. The Search feature on the options page certainly is intended for searching the options. That is its ENTIRE purpose, as is evident in the screen shot that I attached above: https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/thumbnails/uploads/images/2023-01-14-09-45-42-29060c.png

Apparently the fact that the "Files and Attachments" section does not show up when searching for "Attachments" is a known bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1742234

I do not yet know when/whether a fix is planned.