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Why does the FF 3.6.15 lock my PC? Only forced power off cures.

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Since this version of FF loaded a few days ago, my PC locks after a few minute use. Nothing responds, CTRL+ALT+DEL does nothing. Only a force power down can get the PC running again. You will not get a FF fail report so you may not be aware of this problem. Is there a fix available otherwise I can't rely on Firefox.

Since this version of FF loaded a few days ago, my PC locks after a few minute use. Nothing responds, CTRL+ALT+DEL does nothing. Only a force power down can get the PC running again. You will not get a FF fail report so you may not be aware of this problem. Is there a fix available otherwise I can't rely on Firefox.

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I'm having the same exact problem. I thought it may have been my computer so I did a disk cleanup, which barely yielded anything. I scanned for viruses, adware, malware - nothing. The problem you described started happening for me soon after the new version of Firefox installed. It's extremely annoying because I have to have several tabs open for work, and having to power down and reboot takes precious time out of the day, especially when I have to do it like four or five times a day!

C'mon Mozilla - Fix!