SponsorBlock – Skip sponsor, filler, intro, outro, like/sub reminders on YouTube
sponsor.ajay.app
sponsor.ajay.app
It's especially nice on mobile, with ReVanced on Android.
For the record, I pay for YouTube premium, but I love being able to automatically skip the drivel (like, share, and subscribe blah blah blah).
I also loved having 2 YouTube apps: The official as well as Vanced. I could stop one video, open another video in the other app, and then immediately come back to the previous video. It's like browser tabs. I honestly don't know why apps don't have that functionality. Or the OS support running multiple copies of the same app. Imagine Microsoft Excel only allowing you to open one file at a time!
Regarding multiple apps, some Android distributions have that feature, I believe in Samsung it's called Parallel Apps.