It could be that your start page offers Google sign-in and that is why the scripts in the page make that suggestion. In other threads, people have mentioned that the uBlock Origin add-on -- a top ad blocker -- can be used to hide the suggestion, but I haven't kept track of those instructions. These are threads from earlier this year: * https://www.reddit.com/r/firefox/comments/yigex5/google_now_again_asking_to_sign_in_to_other_sites/ * https://www.reddit.com/r/firefox/comments/yoo6oa/how_to_disable_sign_in_with_google/ * https://www.reddit.com/r/uBlockOrigin/comments/yotovr/how_to_block_popups_use_your_google_account/