One cool feature of Emacs is that it lets you directly edit the contents of various archive files like .zip, .tar, .lzh, .jar, etc. Out of the box, though, Emacs isn’t setup to edit .xpi files automatically, but it’s easy to correct that since .xpi files are just .zip files in disguise and Emacs is eminently customizable…
Note: Before messing around with emacsclient, as described below, see the comments for an easier solution.
I could not get Mozex to
launch Aquamacs. Mozex doesn’t seem to deal
well with editor program path names with spaces and quoting doesn’t work. I also
tried to symlink/copy /Applications/Aquamacs Emacs.app
to /Applications/Aquamacs.app and that seems to please Mozex but
then Aquamacs launches and hangs.
What does work however is the Aquamacs
emacsclient.