There’s an add on that lets you create custom containers, a container acts as it’s own session in a way, content, cache, cookies etc are all localised to one container

For example, you open youtube in one then open gmail in another container, neither one will know you’re logged into the other

Video download helper is a bit funny with youtube videos, iirc it adds a water mark to any you dl, as it wants you to donate, if you don’t wanna donate just get ytdlp gui to get your YouTube videos

Video download helper works great for other videos that are sometimes hard to find the url of

Stylus has been a pretty newish one for me, been using it a lot to make Lemmy feeds wider and take up my entire screen

There’s also a convert webp to anything extension that is really handy to have

Video download helper is cool too