Password Alert works by storing a hashed version of your password that’s compared to any passwords you submit over the internet. When the extension notices that youve punched your password into any website thats not accounts.google.com, you’ll be prompted to change your password. The tool also reads the HTML of sites you visit so it can detect websites that are impersonating Google’s login pages. The extension is limited to Google and Google for Work accounts for now, but the code is open source.”]
Source: https://gizmodo.com/new-chrome-extension-warns-you-if-your-google-password-1700927561