・Youtube
Enhancer for YouTube
https://addons.mozilla.org/ja/firefox/addon/enhancer-for-youtube/
SponsorBlock - Skip Sponsorships on YouTube
https://addons.mozilla.org/ja/firefox/addon/sponsorblock/
Audio Equalizer
https://addons.mozilla.org/ja/firefox/addon/audio-equalizer-wext/
Return YouTube Dislike
https://addons.mozilla.org/ja/firefox/addon/return-youtube-dislikes/
YouTube NonStop
https://addons.mozilla.org/ja/firefox/addon/youtube-nonstop/