Password Manager Extension

I made the main code in HTML for any normal website, then I added password saving, though it only saved if the page was always open, and I was able to fix that, then finally coded the json and js file, the json file was for the main details about the page like the name and in the js file was for the capabilities of password saving and even if the page was closed or reloaded but this was for the extension instead of the regular HTML webpage so I could say this is an extension