need a browser plugin for youtube/fb

I would like a plugin that blurs out the time bar/indicator on any youtube video with some form of fighting tag. Not street fights but professional martial arts of all kinds. The purpose is so the end of the fight isn’t spoiled for people who haven’t seen it/dont know how long it is.

The blur should be on the time stamp on the video preview, the video suggestions as you watch, as well as while you’re watching the video!

Including but not limited to: mma, kickboxing, muay thai, bjj, karate, judo, amateur, semi-pro, pro