3rd party matchmaking, custom skins/sfx/gfx, and many more improvements to jstris!

Plays music from Animal Crossing: New Leaf for each hour of the day.

Skips the annoying 'You are leaving Steam' notice when you click on a link in Steam chat.

Adds Watched/Subscribe feature to e621.net

Skips instantly video ads and banners on YouTube

Changes CR's "JoJo's Bizarre Adventure" subs to use the correct Stand names.

Convert unix epoch datetime to regular date format (MM/DD/YYYY) in GMT and local timezones and vice versa.

Run a web based online android simulator that allows to play Arcade games

A multi-browser addon / extension for multiple streaming providers which redirects directly to the source video.

Tools for searching rooms, auto refreshing and joining rooms, admin kick/ban shortcuts, and local mute for chat

Always see the optimal move in any chess.com game. Guarantees wins almost 100% of the time

Puzzle - a puzzle game in which to create the mosaic of the plurality of pattern pieces.

A Firefox port of a Chrome extension to stream web videos to Roku devices.

Redirect YouTube Shorts URLs to normal video URLs.

Enhance UI/UX for https://monopoly-one.com

Adds the YouTube dislike count back to YouTube videos.

a basic simple math operator add-on

Multiple changes to the roblox site for a better user experience.

Synchronises a Twitch clip/VOD to another streamers VOD if that streamer was live at the exact moment in time of the clip/VOD.

Cookie Clicker Cloud is an Webextension which allows you to sync your CookieClicker game with other browsers and to backup your savegame.
You can save as many games you want :)

CCC is free to use and will stay free.

Open In Adobe Photoshop is a new companion for Adobe Photoshop users to send any web image from Firefox to Photoshop via right click menu. Compatible with new Firefox Quantum 57.

Adds movie trailers, library shuffling, 21:9 zoom and audio compression to Plex

Provides fine-grained sound controls for Duolingo.

Adds a few additional features to AniList.

Play all your favorite .io games with this great io games addon. Just find a game you want to play on the io games list, click and away you go. Play io games unblocked and locked.

Know if a game on Steam is also available on Game Pass displaying all platforms where you can play it

Takes a screenshot of a youtube video on pressing Shift + A

Lets you open links with streamlink.
READ https://github.com/plneappl/streamlink-helper/ ! THIS ADDON DOESN'T WORK WITHOUT YOU READING AND FOLLOWING THE INSTRUCTIONS ON THAT SITE!

FanDuel Player Exposure, Salary Cap Calculator, Contest Details & More

Make moves on Chess.com using your keyboard!

Improves your chessboard vision skills, makes chess.com website more accessible.