I was using Firefox as my default browser and had data like bookmarks, add-ons for everyday use, etc. but after I reinstalled windows and installed Firefox again I forgot which email was link to my data as I had multiple emails logged in. Now I have tried 2-3 emails which didn't work in bringing my data back and I don't remember the password of my other emails, I can recover them by forgot password but I it says resetting password will clear history bookmarks, etc.| I can afford to loose history and saved passwords but is there a way I can get Firefox back to my configuration and add-ons, etc I was using previously?
PS: I do have windows.old file after windows installation-If it could help./
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You can check if that C:\Windows.old folder has your previous Firefox profile folder.
The prefs.js file in the profile folder stores the email (username) as a pref named "services.sync.username". Also the logins.json file stores the credentials to connect to Sync (chrome://FirefoxAccounts). You would need to restore logins.json and key4.db to recover the logins.