My problems with high CPU usage by Firefox started a few weeks ago. Here are the fixes I've tried so far: quitting firefox and opening new browser window: helps briefly, but screen freezes start again within a minute or two, sometimes right away restarting computer: doesn't help any more than quitting and restarting firefox clearing cache and history: did not help (have done this repeatedly) disabling extensions: did not help updating firefox again: did not help uninstalling firefox, removing all hidden folders, clean reinstall: seemed to fix problem initially, but after a few days, I'm right back where I started running firefox --debug with gdb installed: gdb found no debugging symbols turning off chat in Facebook: did not help * * * * * I am currently running Firefox 10.0.2 with Linux Mint 9 (Isadora). My configuration is x86_64-linux-gnu. I generally keep browser tabs open for email, Words with Friends (my only regular use of Facebook) and Ravelry, with one or two other tabs open as needed for other tasks. Possibly useful information from my system information summary: Processor : 4x Intel(R) Core(TM) i3 CPU, 550 @ 3.20GHz Memory: 5922MB (1268MB used) Since the clean re-install of Firefox, I have only added one extension (Add to Search Bar 2.0) and re-imported my bookmarks list. The other extension and add-ons (which I presume came with the install) include Ubuntu Firefox Modifications 0.9.3, IcedTea Web Browser NPR Plugin, iTunes application detector, and Shockwave Flash 11.1 r102. Just for grins, I tried disabling them all again, and it made no difference. All system updates are current. I've been keeping my system monitor open and each time my browser freezes, I'm seeing 100% CPU usage by Firefox (actually, as high as 120%, although I don't know how that is possible). Any other suggestions? I'm really motivated to keep using Firefox, but I'm not sure what else to try. Thanks.