The latest build of Mozilla includes a fix for a relatively long-standing MIME type bug that would do things like rename “file.mpg” to “file.mpg.mpeg” because multiple extensions were defined for the MIME type and it would insist on saving anything you downloaded with the first extension in the definition list. It’s nice to not see that problem any more.
However, seemingly at the same time (although it may well have been started earlier than this and I just never noticed), Mozilla now hangs, causing you to have to shut it down and manually kill the process, whenever you try to download a .tar.gz file. Apparently this happens with Firebird too. (It’s not clear if it happens on any platform other than Win32.)
Update: Oh, yes. I forgot to mention that for the past week or so, Mozilla has insisted on “forgetting” that it’s the default browser. Every time I install a new build I get asked about it and have to go through the pain of dis-associating all image files again.