Actually, though I've dabbled but little, it seems pretty easy to get arbitrary encryption on firefox. For an example, look at the LeetSpeak addon, which provid

Actually, though I've dabbled but little, it seems pretty easy to get arbitrary encryption on firefox. For an example, look at the LeetSpeak addon, which provides a bunch of ways to transform text, both in textboxes and on the page. The real challenge I can see is to provide a good interface for sellecting from the (potentially hundreds of) public keys at you disposal to encrypt with.