I have been using iGoogle as my homepage in Firefox for years. I do not have my personal info set to automatically clear out upon exiting Firefox. Last week, I deleted my personal info from Tools, Clear Private Data, and I deleted Cookies, Browsing History, Saved Passwords, Authenticated Sessions, Cache and Search Terms. I did this multiple times while dealing with an issue on another web site.
Now, every time I close Firefox and reopen it, I have to manually sign back in to iGoogle, though I have Remember Me on This Computer checked on the iGoogle login, and have not cleared ANY private data since.
I have 15 years experience as a network admin, and I hate to admit it, but this tiny issue is kicking my butt!