On both computers, I'm running FF 7.0.1, but the problem has been with me on my iMac ever since FF 5. Both computers have the same add-ons, and as far as I can tell all settings are the same as well. But something obviously is limiting the number of pages that are retained in the "go back one page" history. I've searched in vain repeatedly for some setting that might explain the problem. I would appreciate any guidance you can provide. I've set forth below my list of extensions: - Abine 0.739 - Adblock Plus 1.3.10 - Add-on Compatibility Reporter 0.9.2 (Disabled) - Apture 2.0.0 (Disabled) - AutoPager 0.7.0.0 - Awesome screenshot: Capture and Annotate 2.3.3 - Backward/Forward History Dropdown 0.2.3 (Disabled) - Better Gmail 2 1.2 - BetterPrivacy 1.67 - Boomerang for GMail 1.0 - CoolPreviews 3.5 - DictionarySearch 7.0.0 - Download Statusbar 0.9.8 - Extension List Dumper 1.15.2 - Google Docs Viewer 1.8 (Disabled) - Googlebar Lite 4.7.11 - Greasemonkey 0.9.11 - Jureeka! 4.0 - LastPass 1.75.0 - NoSquint 2.1.2 - OptimizeGoogle 0.78.2 - PDF Download 3.0.0.2 (Disabled) - Read It Later 2.1.3 - Readability 1.11 (Disabled, Incompatible) - Safari View 1.3.4 (Disabled, Incompatible) - Save as PDF 1.5 (Disabled) - Screenshot Pimp 3.4 (Disabled, Incompatible) - Session Manager 0.7.7 (Disabled) - Shorten URL (Bit.ly) 0.68 - Show my Password 2.0 - Stylish 1.2.3 - Tab History Menu 2.1.1 (Disabled) - Tab Mix Plus 0.3.8.6 - Test Pilot 1.2 - Thumbnail Zoom 1.4.3 - TinEye Reverse Image Search 1.1 (Disabled) - TooManyTabs 1.3.7 (Disabled) - Unwrap Text 0.5.4 - URL Fixer 3.1 - Xmarks 4.0.0