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Message: <blockquote data-quote="Slydude" data-source="post: 1636985" data-attributes="member: 131855">A .plist file holds basic information about how a program is configured. When you change the settings in a program it's generally stored in a plist file.Plist files are stored inside your user folder in a folder called preferences. In OS X 10.7 and higher that library folder is hidden.You have to <a href="http://www.mactrast.com/2013/10/show-user-library-directory-os-x-mavericks/" target="_blank">make the folder visible</a> before you can do anything. Once that's done look for a Preferences folder. The Firefox info you need will be in there. Move the Firefox plist somewhere else like the Desktop. When you re-launch Firefox it will create a new file. This should clear any problems due to a corrupted file.</blockquote>