Hey Gerv,

Bryan Clark's got something related, though not exactly what you want, but related to Bugzilla and Thunderbird:

http://clarkbw.net/blog/2008/04/04/extending-bugzilla-links-in-thunderbird/

Seems like you'd miss out on editbugs-impaired users commenting that things aren't really fixed....

Actually, I misread that, never mind.

Once the major kinks get ironed out of Ubiquity for Thunderbird, this will be really easy to do.

For reference, see: http://jonoscript.wordpress.com/2008/10/15/i-remember-nowi-remember-nowwhy-they-called-it-thunderbird/

I'm writing an expository extension for TB trunk builds that will have a bugzilla account type. Once I get that finished, you can take it and hack off of that to get what you want.