Firefox on Mac OS X Annoyances (Jeremy Zawodny's blog) Found one piece of potentially very good news:
"Just FYI, I was looking at the Firefox Roadmap (http://www.mozilla.org/projects/firefox/roadmap.html) the other day, and I noticed the following "Anticipated further Release Candidates" (after it hits 1.0 on the PC):

1.0PR2 (MacOS X) - Aquafication release. Focus on outstanding UI issues particular to MacOS X, redevelop UI to support cross platform nature, etc.

1.0 (PC) is actually listed as 1.0 alpha 2 for the Mac."

so hopefully Mac commands will work with Firefox next release, and perhaps some extensions that don't work on Mac will follow.