Several posts have made the round in the last weeks that explained how a specific webmail service could be selected as the default client when the user would click on a mailto link on a website. One article that can be seen as an example would be my How To Make Gmail The Default Mail Client article that I wrote last week.
That’s fine if you use Gmail, or another mail client as your primary mail client and practically no other. But what if you have accounts at Gmail, Yahoo Mail and AOL Mail? That’s where Mail From steps in. The Firefox add-on provides a way to select the mail client that should be used to send the mail from.
Mail From currently supports Gmail, Yahoo Mail, AOL Mail and the default mail client but the author has plans and offers a forum to suggest additional mail clients that should be added to the Firefox add-on.

A right-click and the selection of the Mail From Services entry displays the currently available webmail services that can be picked. It is possible to remove any unnecessary services in the options of the add-on.
Users need an account at Mozilla.org to download and install the add-on because it is currently in the sandbox.
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I use an extension called E-Mail this! Bookmark Extension. This allows you to right click on a link and choose to e-mail it via g-mail, yahoo, or any 3rd party program such as Sea Monkey and Thunderbird and of course windows mail. I think it is a decent extension!