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I am getting this from firfox when I open it up... "The bookmarks and history system wil not be functional because one of firefox's files is in use by another application. some security software can cause this problem."

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This popped up while I was online. all of a sudden my bookmarks and history were gone. Now firefox will not let me save new bookmarks or let me keep a history! help!

This popped up while I was online. all of a sudden my bookmarks and history were gone. Now firefox will not let me save new bookmarks or let me keep a history! help!

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This is a mac so i dont have any virus protection on my computer?