Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

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

Calibre Opens Endless Tabs in Firefox

  • 2 respostas
  • 1 has this problem
  • 4 views
  • Last reply by MarjaE

more options

After trying to open an Epub in Calibre, I suddenly had endless tabs opening in Firefox. I disconnected, stopped Calibre, stopped Firefox, restarted Firefox, and eventually they stopped popping up.

I need a number of accessibility fixes to use Firefox and to browse the web, so I can't refresh Firefox.

I checked the Applications prefs but can't see anything that could trigger this in Firefox.

I can't find any info on what could cause this in Calibre either.

I suspect something was wrong with the Epub.

After trying to open an Epub in Calibre, I suddenly had endless tabs opening in Firefox. I disconnected, stopped Calibre, stopped Firefox, restarted Firefox, and eventually they stopped popping up. I need a number of accessibility fixes to use Firefox and to browse the web, so I can't refresh Firefox. I checked the Applications prefs but can't see anything that could trigger this in Firefox. I can't find any info on what could cause this in Calibre either. I suspect something was wrong with the Epub.

All Replies (2)

more options

You get tabs opening endlessly if you select the Firefox program to handle a file when you get an "Open with" dialog. You should never select Firefox as the application to handle a file.

Try to rename (or delete) the mimeTypes.rdf file in the Firefox profile folder to reset all file actions.

You can use this button to go to the current Firefox profile folder:

more options

"You get tabs opening endlessly if you select the Firefox program to handle a file when you get an "Open with" dialog."

And I didn't do that. Although I hope removing mimetypes helps.