Cool idea and onboarding experience. I spun up Chrome to demo it, and although its got the rough edges of a prototype, the potential is there.

I created a rule to remove thumbnails and shorts from YouTube, and after a few failed attempts, it succeeded! But there were massive tracts of empty space where the images were before. With polish and an accessible way to find and apply vetted addons so that you don't have to (fail at) making your own, I would consider using it.

My daily driver is Firefox, where I've set up custom uBlock Origin cosmetic rules to personalize YouTube by removing thumbnails, short, comments, images, grayscaling everything except the video, etc. My setup works great for me, but I can't easily share it with other people who would find it useful.