I wish someone would tell Firefox. I just this second ran the updater-- which it's supposed to do automatically-- and it gave me 3.5.19, dated 28 April. And then, after installing and restarting, it has the nerve to tell me
Thanks for downloading Firefox, but this version is out of date. For the latest security, performance and feature enhancements we strongly recommend that you get the newest version instead.
with further link to v. 4.0.1.
Matter of fact, I'm pretty sure it did the same thing when I got 3.5.
Mozilla's updates are consecutive. You need x before getting y to end up at z... or in other words one has been lax in updating OR working on the operative "If it ain't broke (for me) I'm not going to fix it."