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See the article ] for more information, such as where to find the folder when Firefox is not open. * In the page that opens, click the "Show Folder" button ** Go to Help (or ] > ]) > Troubleshooting Information ** Enter '''about:support''' in your address bar and press enter * Go to your Troubleshooting page, either: Hopefully when that happens, it will default so that PDFs will open in Firefox. Try renaming your ''mimetypes.rdf'' file in your profile folder - this file is where the file actions are stored so when it is missing, Firefox will recreate it. Read this answer in context 👍 3 All Replies (4)

Applications panel - Set how Firefox handles different types of files.

If it works, you can delete the mimetypes.old file if it doesn't and you want your application settings back you can rename the mimetypes.old file back to mimetypes.rdf (make sure you exit Firefox before doing that).

Rename the mimetypes.rdf file to mimetypes.old and then restart Firefox. See the article Profiles - Where Firefox stores your bookmarks, passwords and other user data for more information, such as where to find the folder when Firefox is not open.

In the page that opens, click the "Show Folder" button.

Go to Help (or > ) > Troubleshooting Information.

Enter about:support in your address bar and press enter.

Go to your Troubleshooting page, either:.

To go to your profile folder if Firefox is open: Try renaming your mimetypes.rdf file in your profile folder - this file is where the file actions are stored so when it is missing, Firefox will recreate it.