YouTube Video Filter от OsSLatvia

This Firefox add-on helps users customize their YouTube experience by filtering out unwanted recommended videos based on personalized settings. Ideal for those looking to minimize distractions, avoid specific content, or create a more focused browsing experience on YouTube. Currently implamented features include filter by:
-video age
-video views
-video max length
-video min length
-hide playlists
-hide livestreams
-hide watched videos
-blacklisted word filter
Works for english, french, spanish, latvian version of youtube, but added ability to set custom language settings by user, for users that use different language youtube

Added support for dark mode, but it looks at browser settings, youtube has its own option for dark mode that can be set to not match browser in witch case style will not match.

Added option to filter sidebar recomendations on videos, search results, channel and subscribtion views. Added settings tab so you can control where filters are automaticly applied (default Home page and Sidebar).

Blacklisted word list is set in general settings, and through filter settings you can turn them on/off

damaredayo added feature for removing watched videos that looks at red bar on recomendation if you already seen it or had started watching it