The profile directory for Firefox will be changed (for the last time) to Mozilla/Firefox/ (from Firefox/), as Ben Goodger announced at the MozillaZine forums. This follows up on the last profile directory change from Phoenix/ to Firefox/. This also seems to mean that the profile directory for the Mozilla suite will go into Mozilla/ while having a Firefox/ directory under that (i.e. Mozilla/Firefox/) for Firefox - a little weird.

As usual, beware of inadvertently losing your profile if you use Mozilla Backup - be sure the check that it takes into account the directory change when migrating across nightly builds.

Users of the Firefox 0.8 release, don't worry, because I'm sure Ben and his team will have a neat, transparent migration script for your profiles when Firefox 0.9 comes out. You probably wouldn't have to do a thing.