Are these (in desc) browser extensions safe? and are there any safe, free opensource vpn extension for the browser?
Mullvad for the VPN. And you don't need the ,,AdBlocker for YT" and especially not ,,Ad Block Plus" combinef with ,,AdGuard" use one of those or switch to uBlock, but those I mentioned are safe (Excluding YTADBlocker, don't know that one)