I'm using FF 22 on a MacBook Pro running OS X 10.7.5. In Preferences>Applications I have set the app for mailto as Gmail. However, mailto links refuse to work. They generally open a blank tab. Gmail is also set as the default mail application for the system. That didn't help.
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Create a new profile as a test to check if your current profile is causing the problems. See "Creating a profile":
Profile Backup and Restore
Try to delete the mimeTypes.rdf file in the Firefox profile folder to reset all file actions.
You can check the network.protocol-handler.external.mailto prefs on the about:config page.
If network.protocol-handler.external.mailto prefs are user set (bold) then right-click and Reset them to the default value.
That was fast! Fortunately, I didn't need to mess with the profiles; resetting the prefs on about:config did it. Thanks so much, folks!