Google is paying copius sums of money to in AdBlock Plus (asuming this is the extension you are speaking about), makes sense to avoid it completely and run uBlock Origin.
https://www.insider.com/why-google-has-to-build-its-own-adblocker-2017-4
LINE - just the tip of the iceberg of privacy and security concerns. https://reports.exodus-privacy.eu.org/en/reports/jp.naver.line.android/latest/
Agreed. May best to get family and close friends on Signal right away. Telegram is horribly unsecure.
Signal desktop is designed to be a stand alone app that uses the phone phone to first verify the connection via QR but after that relays messages, calls, erc direct from and to the server, inrependently of the phone app.
This is old news, from 2022!!