Firefox 3.6.2 using Mac OS 10.5.8 won't quit, must force quit

Hi Gang,
Have loved FF for years on my Macs. But for last few months FF will only quit normally maybe 20% of the time; the other 80% I must force-quit it. SOMETIMES it will quit, but I have to wait SOOOOO LONG that I can see the grass growing out my office window. Any ideas? I am using FF 3.6.2 running Mac OS 10.5.8 on hardware PowerMac G5 Dual Processors (which was the last of the PPC processors, before Intel chips came into use). I have plenty of RAM. This machine is running on a restoration from Time Machine, from when my MacBookPro laptop was stolen.

Are you using Clear Recent History to clear any data when you close Firefox?
*https://support.mozilla.com/kb/Clear+Recent+History
Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions or hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
*https://support.mozilla.com/kb/Troubleshooting+plugins

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