Mozilla are looking for testers using Windows Vista (a recent release candidate). If you are interested email marcia (at) mozilla (dot) org and you’ll be notified of any areas that need testing.
It looks like Firefox 2 will have a point release to improve Vista compatibility, this should occur before Vista hits the streets for public consumption in January. It’s likely that this release will have the same toolbar layout as under XP so it won’t look like a native application, however, the support for native themes in Mozilla apps means that the widgets and colour schemes will still look correct.
It’s likely that Mozilla will work on making Firefox and Thunderbird look like native Vista apps in the future (maybe Firefox 3). This will be good as long as they keep the traditional look for XP and earlier as otherwise, like IE7, the browser will not fit in with the platform conventions.
Ideally when under Vista I’d like to see Firefox comply with the platform conventions, which would mean a different toolbar layout, but it’d be good to make it customisable enough to make the XP layout also available to Vista and vice-versa. But the defaults should be right for each platform.
Even if you’re not using Vista there’s still plenty you could do to help the QA team. If you’re an experienced tester your skills would be welcome and if you’re new to testing this can give you very useful experience with writing good bug reports, working on a large project, working with bug tracking systems, etc. A good place to keep an eye on is the QA blog. Events called bug days are frequently held to help newcomers get started.