Earlier quoted context omitted.
BlockTube removes videos based on words in titles and channel names: https://addons.mozilla.org/en-US/firefox/addon/blocktube/
Don't want to give another extension access to read my screen though. Why do extensions require such broad access? Can't think of this needing anything outside the YouTube domain
Doesn't appear to given the permissions listed:
"Access your data for www.youtube.com"