FF android user data is 21GB !
? Cleared cache and private user info. Anything else before uninstall/delete data?
Wšykne wótegrona (1)
Make sure your bookmarks are synced to your Firefox account in case you want to keep them. Also make sure you do have your backup codes for 2-step authentication (if it's turned on), and your account recovery key for your Firefox account just in case.