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.

Manage file associations

  • 2 replies
  • 1 has this problem
  • 626 views
  • Last reply by rmberkowitz

rmberkowitz
rmberkowitz
more options

I started getting the message that an associated helper file can't be found when I try to open a pdf. I found instructions that say I should go to tools/options, select content, and then in the file types section select manage. But there IS no file types section under content. Where has the new Firefox moved the file types section--I can't find it anywhere.

I started getting the message that an associated helper file can't be found when I try to open a pdf. I found instructions that say I should go to tools/options, select content, and then in the file types section select manage. But there IS no file types section under content. Where has the new Firefox moved the file types section--I can't find it anywhere.

Chosen solution

Hello,

In your Options dialog go to the Applications tab. You can manage your file associations there.

Note that if you are still having problems with your file associations, you may have a corrupt mimetypes.rdf file. You can go to your profile to rename it to mimetypes.rdf-old or something so that Firefox can rebuild it and reset all your associations to default.

To access your Profile, go to the about:support page, or:

  • Help (or New Fx Menu > Help-29) > Troubleshooting Information

And click Show Folder.

Read this answer in context 👍 1

All Replies (2)

CoryMH
CoryMH
more options

Chosen Solution

Hello,

In your Options dialog go to the Applications tab. You can manage your file associations there.

Note that if you are still having problems with your file associations, you may have a corrupt mimetypes.rdf file. You can go to your profile to rename it to mimetypes.rdf-old or something so that Firefox can rebuild it and reset all your associations to default.

To access your Profile, go to the about:support page, or:

  • Help (or New Fx Menu > Help-29) > Troubleshooting Information

And click Show Folder.

Modified by CoryMH

rmberkowitz
rmberkowitz Question owner
more options

Thank so much for you help. Renaming that file did the trick. Have a great weekend!