I haven't kept track of Firefox releases, and the latest (1.0.4) may include some of what they're talking about here. The info I got indicated that what's needed now are patches, rather than just a new version, and as of a day or so ago the patches available were only "partial fixes;" but three or four prior vulnerabilities were fixed in versions releases, so it would be well to update, probably. Firefox people have made changes in their download sites because of this latest glitch, but you should be redirected automatically using old bookmarks you have.
A newsblast I got today said something about a new Firefox toolbar that incorporates some "extra security" and blocks popups, but I haven't looked at whether it's really anything new. It was a "marketing newsletter" rather than a tech one, and asks for a signup to a "free membership" on the site with the info. Too many of those, and you loose track of passwords, and if you use the same password too often it gets "too much exposure." - - maybe later.
There are a lot of plugins available - you'll have to do your own looking for what might be helpful.