Have you tried these links? https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data https://support.mozilla.org/en-US/kb/recover-lost-or-missing-bookmarks https://support.mozilla.org/en-US/questions/1297681#:~:text=You%20can%20copy%20logins.,use%20the%20about%3Aprofiles%20page.

Normally when you run Firefox's own uninstaller, it won't delete your data without asking you. But if you do tell an uninstaller to delete your data, it can be hard to recover because it is permanently deleted instead of being dropped in the Windows Recycle Bin. Some things to check: '''''(1) Alternate Profiles?''''' Inside Firefox, type or paste '''about:profiles''' in the address bar and press Enter/Return to load it. This page should list at least one profile and could list many. (Each profile has two folders and one or more buttons. Do not use any Remove buttons!) The profile that Firefox is currently using will have this: '''This is the profile in use and it cannot be deleted.''' Do you have any other profile(s) listed on this page? If so, you can check whether it is the one you were using recently by clicking its '''Launch profile in new browser''' button. If it isn't what you want, simply close that new window. If it IS what you want, back on the about:profiles page, click the '''Set as default profile''' button for that profile so Firefox uses it automatically at the next startup. Any progress here? '''''(2) Old Firefox Data?''''' If Firefox performs a Refresh, it moves your data to your Windows desktop inside a folder named '''Old Firefox Data'''. This folder wouldn't be removed by Firefox's uninstaller. Do you have a folder like that? If so, how fresh are its contents? '''''(3) Windows 10 Restore Points?''''' During updates, Windows may capture a copy of your Firefox data into a restore point. '''To avoid mangling other data, do NOT use system restore.''' Instead, try a program that lets you selectively export data out of restore points. Here are two options for that: * ShadowExplorer: http://www.shadowexplorer.com/ * Shadow Copy View: https://www.nirsoft.net/utils/shadow_copy_view.html Before using them, set Windows to show hidden files and folders before diving in: https://support.microsoft.com/en-us/windows/view-hidden-files-and-folders-in-windows-97fbc472-c603-9d90-91d0-1166d1d9f4b5 Then within the most recent restore point shown in the program, you can explore along this path to see whether you can find a shadow copy of your profile: \Users\''your-user-name''\AppData\'''Roaming'''\Mozilla\Firefox\Profiles\''your.profile'' Actually, you could export out the entire Profiles folder to your desktop and we can help you mine it for potentially useful files. Let us know what you find.