[ALUG] Anyone using Firefox 3.0 yet?

Has anyone here moved from Firefox 2.0.x to Firefox 3.0 yet? If so are there any big (or small) issues? My main problem is that my favourite add-on (Mozex) isn't available for Firefox 3.0 and looks like it may never be. There is an alternative (ItsAllText) but it's not so flexible and doesn't allow one Mozex facility that I do use (the ability to launch a local program from an arbitrary URL). One simple question occurs to me, can Firefox 3.0 be configured to call a text mode program (e.g. mutt in my case) on mailto: links? -- Chris Green