User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; sv-SE; rv:1.9.3a1pre) Gecko/20091111 Minefield/3.7a1pre
Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; sv-SE; rv:1.9.3a1pre) Gecko/20091111 Minefield/3.7a1pre
This is basically bug 499574 (one of the first bugs I filed) but with a clearer description. I think that storing mailto: links, that is, e-mail adresses would be an advantage. For example, I've found myself looking for an e-mail adress I had clicked the previous day, but couldn't find the page which contained the e-mail adress, and thus not the adress itself.
I can't see any issues with implementing this (file: protocol is already there, no technical issues to deal with), except for privacy. There's the :visited leak exploit, which might have serious consequences if you're handling "important" e-mails.
Therefore, I suggest that this is not on by default, but as an option in the settings. I know that settings outside the about:config list is kept to a minimum, but the list of what is stored in the history isn't exactly full.
This might raise the question, "Should we store all protocol URL's in the history?". Well, you are free to file another bug for that.
To conclude, I think people who do not mind a minor security issue will appreciate this and I hope that you too, understand that this has advantages.
*** Bug 499574 has been marked as a duplicate of this bug. ***