If you haven't, set "ds.serving-sys.com" to 127.0.0.1. They seem to be the biggest offender in JavaScript firefox crashes for me (for those of you who get them).
By the way, I tried installing Firefox again, and that didn't fix my problem. I'll consider backing up my bookmarks, and deleting my profile though, so it can be re-created. In a perfect world, I wouldn't have to do such a thing, but for all the good things the Mozilla Foundation does, I guess I can't be too mad at them for this.
Note:
For anyone who cares, ds.serving-sys.com identifies itself as "Microsoft-IIS/6.0". Makes sense an evil server would use evil server software
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Whoever the IIS apologists are on this site, you all can complain about that comment all you want. I tried IIS once, and someone broke in via the FTP server (and yes, everything was up-to-date, unpatched vulnerability). No thanks. For those of you who say, "but it's only ONE problem, give it another chance!", you're wrong. IIS has a nasty history, and I would prefer not to take my chances with it.