Yea, I have a couple more that I forget does what (I think a couple are for hiding youtube games and shorts and stuff), but it should just look like this in my filters.

www.youtube.com/##.paper-toast-open.yt-notification-action-renderer.style-scope.toast-button

I believe it was this one, just add it as part of the filter list in ublock

The extension I used for user agent was this one. I don’t think it matters what you spoof as, but I chose to spoof as chrome. https://addons.mozilla.org/en-US/firefox/addon/user-agent-string-switcher/

So far it worked and I’m back to no ads and no interruptions

Oh hey I ran into that issue, fixed it by blocking the element on ublock and spoofing my user agent

Edit: I put more details under nameisnotimportant’s comment, I was about to head to bed so I didn’t really provide details LOL

Sounds like you already made good progress! Keep it up