In case you haven’t already heard, it’s over for Mozilla as far as future development is concerned. Oh sure, the Mozilla Foundation is going to keep maintaining the 1.7 branch, but that’s it. All future work is aimed at Firefox & Thunderbird. This was announced years ago, but it finally became final this week, and evidently some folks are (justifiably) p.o.’d at the Mozilla Foundation for not making things clearer, sooner.
(Of course, volunteers can still keep Mozilla going, and it looks like folks are trying to do just that. More news as it develops.)