The Refresh feature (or uninstall/reinstall) might not be removing the problem because it preserves some of your personal data, including history as you noticed. If this is a problem with the database file (places.sqlite) that store history and bookmarks, the easiest workaround is to rename the file and have Firefox start a new one. However, then you lose all your history, so that's really not very attractive for people who rely on history for revisiting sites. In case you want to try that -- if no other good suggestions come along -- here's how: ''If you can open Firefox:'' Open your current Firefox settings (AKA Firefox profile) folder using either * "3-bar" menu button > "?" button > Troubleshooting Information * (menu bar) Help > Troubleshooting Information In the first table on the page, click the "Show Folder" button. This should launch a new window listing various files and folders in Windows Explorer. Leaving that window open, switch back to Firefox and Exit, either: * "3-bar" menu button > "power" button * (menu bar) File > Exit Pause while Firefox finishes its cleanup. ''If you cannot start Firefox:'' Use the steps in this article to find your currently active profile folder: [[Profiles - Where Firefox stores your bookmarks, passwords and other user data]]. ''Both scenarios:'' Rename '''places.sqlite''' to something like oldplaces.sqlite. (Please rename and don't delete in case the automatic rebuild goes awry.) Firefox creates temporary files related to places.sqlite and those may need to be renamed/removed as well. Check for '''places.sqlite-shm''' and '''places.sqlite-wal''' and rename them as well. When you start Firefox back up again, it should start a new places.sqlite database and import your last automatic bookmark backup. Can you confirm that all your bookmarks are present? Does Firefox run any better?