How to check your Browser data is safe

They keep your data if you join or sign up for any website. Frome years daily, you have been doing this. Some websites you visited only one time and they kept your data, and you are not aware of this. Now you can check and delete your data from unsafe or stranger websites.
Sign up with the same email or credential. You will find the list the websites which have your data. Now check if any website is unsafe or not in your use then you can delete your data.