That's exactly the problem with blink (chromiums rendering engine) based browsers. They help google build a monopoly and slowly take over the whole browser market which allows them to do stunts such as their recent web attestation API.
We are at a point where a crushing majority of browsers (even libre/privacy ones) and users use it and websites only care about blink compatibility and there is little room for engines like gecko or even webkit.
The only reason youtube still exists with no viable alternative (for the populace) is the sheer amount of content thats uploaded on the platform and creators already being there as well as the difficulty/cost of sustaining a service that stores and serves video.
There are so many platforms that do youtube's job as well if not much better than it but that will never rival it because youtube simply has all the content and content creators.
EDIT: imo odysee and peertube are the best alternatives we currently have but they will sadly never make youtube fear a single bit for their market share
You can add the normal vscode extension repos https://github.com/OliverKeefe/vscode-extensions-in-vscodium