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mailto has disappeared, how to add it back in the application list?

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I have no mailto application in Firefox so I am unable to use the send link function. How can mailto be added back in so that I can choose a default mail application?

I have no mailto application in Firefox so I am unable to use the send link function. How can mailto be added back in so that I can choose a default mail application?

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To use the send link, you need to have a default mail client set up for your operating system.

http://kb.mozillazine.org/Default_mail_client

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Hmmm, well that is the root of the problem. I use Yahoo Mail and I tried using Outlook with it and when it was not configuring correctly and backing up mail in the outboxI uninstalled Outlook and that's when mailto disappeared from Firefox. I just want to send from Yahoo Mail but I don't seem to be able to do that.