forward/back buttons don't work, cant bookmark sites
The forward and back buttons have stopped working and I cannot bookmark any new sites. Existing bookmarks are OK and working. I'm running Windows XP Pro and have just installed Zone Alarm Extreme Security. Firefox is my default browser.
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That combination of problems indicates a problem with the file that stores bookmarks and history. For details on how to fix it see http://kb.mozillazine.org/Locked_or_damaged_places.sqlite
Be aware that ForceField (part of Zone Alarm Extreme Security) can lock files in the Firefox Profile Folder and can prevent Firefox from saving changes.
See http://download.zonealarm.com/bin/media/pdf/ForceFieldUserGuide.pdf