FF doesnt work with a LOT of sites, but it shouldn't break lifesaver. Lifesaver is using a different technology to grab the updates (FTP) so it shouldnt be a factor as far as I know.
Could it just be a timing coincidence? Is it possible you have a new firewall blocking the ftp ports? I'd check your a/v or firewall software and allow the program access, in case this is a possible reason.
Are you fully connected to AOL prior to doing the update in lifesaver? Keep in mind that it has to be physically online before you do so, so it can connect to the server. Just throwing it out as a possibility.
-if Im using Firefox, why do I need Microsoft updates???
Firefox is a nice alternative, but isn't necessarily "safer". (as advertised) It is relatively unproven and I believe it had more exploits in 2005 than IE by about 4:1 Most hackers target IE because its sloppy and has the largest pool of users, but FF will eventually become a target as well.
Microsoft updates fix windows itself, IE, the email programs, Office programs, and other windows related improvements. They're not just for IE, and will correct issues that can potentially effect FireFox users as well. For example, many attacks come through ports or email - not always the web.
The updates are still very important, just as is having a good a/v blocker and an adware/spyware scanner.
Mike