System locks up when I open Firefox.

I have a Lenovo Thinkpad running Windows XP sp3.
Two days ago, Firefox locked up, along with windows. I had to turn off and restart. The system will restart after running chkdsk and recovering a bunch of "orphaned" files. It doesn't report any problems with the hard disk.
After restarting Windows, I am able to connect to the internet and run other browsers and generally the computer runs fine until I try to run Firefox. It opens and gives the message "Well, this is embarrassing. . ." but nothing else happens. The entire system freezes up until I shut it down and restart the computer.
I have received a couple of blue screens, but they give different crash ids and the recent lock ups have had no blue screens.
I have sent reports to Mozilla with the reporting software.

Hi, please go to Options (cog wheel) - in the 3-bar menu unless you've moved it. Then in the General tab, make sure that 'When Firefox starts' is set to 'Show my home page.' Also make sure that 'Home Page' is set to '''about:newtab '''Then restart Firefox.
Hope that helps.

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