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* Possibly reduce number of buttons? When you add sign+crypt functionality, you're going to have Sign, Sign and Send, Crypt, Crypt and Send, Sign+Crypt, Sign+Crypt and Send. Some people sign or encrypt almost every message they send, and for them, it's nice to have "and Send" buttons; however, it would be nice to be able to tell FireGPG to leave them out.
* If no text is selected, guess what the user wants to encrypt. For example, if there were no lines beginning with ">", it would encrypt the whole message. If previous messages were quoted, it would encrypt the first non-quoted block. Perhaps for some cases you would ask for confirmation: some people reply to messages line-by-line, resulting in a message with alternating quoted and non-quoted blocks. For this, you could do something like select the text from the first non-quoted line to the last non-quoted line, and ask the user to confirm this is what they wanted signed/encrypted.
* Why does the whole message end up selected when I only encrypt part of it?

The above were intended as constructive criticism. I don't mean to complain at all - the Gmail integration really is quite nice, and these are just minor points.