According to the CNet article here, FireFox 1.5 just had it's first flaw discovered.  The good news is that simply deleting the history.dat will get you back up and running, if you do happen to fall victim.  By the way, you usually find it under Documents and Settings\[username]\Application Data\Mozilla\Firefox\Profiles\[profile name].default.

"The latest Firefox flaw exists in the history.dat file, which stores information from Web sites

users have visited with the Firefox 1.5 browser, according to a posting on the Internet Storm

Center, which monitors online threats.

If the topic of a page is crafted to be long enough, it will crash the browser each time it is

started after going to such a page," according to the Internet Storm Center posting. Once this

happens, Firefox will be unable to be started until you erase the history.dat file manually."

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