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- Under Application Basics, click on Open Containing FolderShow in Finder.
- From the menu at the top of the Firefox windowbar, select FileFirefox and then select the ExitQuit FirefoxQuit menu item.
- Click on the file named cert8.db.
- Press Cmd+Delete.
- Restart Firefox.
more info http://support.mozilla.com/hu/kb/Could+not+initialize+the+browser+security+component