First, you may want to make a backup of your profile folder. It contains not only your current bookmark list, but a folder of backups. But these are not saved forever. To back up Firefox, see [https://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information] (you can copy your entire profile folder somewhere ''outside'' the Mozilla folder). The following article has suggestions for recovering bookmarks: [http://support.mozilla.com/en-US/kb/Lost%20Bookmarks Lost Bookmarks | Troubleshooting | Firefox Help]. Any luck? --- Version 3.5.2, if that's what you really are running, is not secure. You should update at least to 3.5.19, and preferably to a newer version.