My bookmarks disappeared and I can't get them back or re-install them.

Susan, it might be worth checking the integrity of your Places Database files, which are where Firefox stores bookmarks and their icons. To do this: # Go to Help menu (press alt+H). # Select "More Troubleshooting Information". # On the page that opens, scroll down to "Places Database" and press the "Verify Integrity" button. # Once the check has finished, Look for any lines in the report that startt with a "-" or that contain the term "error". If any errors are reported, try restarting Firefox and re-running the integrity check to see if they were fixed by the first check. You may want to repeat this 'restart and re-check' process again if errors are still found. ---- If that doesn't help, then you could try the steps in this article to see if your bookmarks can be found in a different profile: https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update