Grab and download media (image, audio, and video) resources by monitoring network (like FlashGot or Flash video downloader extensions)
Multiple account (or label) Gmail notifier (without storing passwords)
a download manager with multi-threading support
Media Converter and Muxer is an easy to use video and audio converter and muxer. WebExtension replacement is https://addons.mozilla.org/firefox/addon/media-conversion-tool/
Easy to use video and audio converter and muxer written in WebExtension built on top of the well-known FFmpeg converter
An elegant bookmarks manager with fuzzy search and more
YouTube Control Center is an open-source project that aims to enhance the overall YouTube experience by providing the end user with more control in what the playback process is concerned.
Everyday note-taking solution.
A simple yet powerful media player built on top of video.js project
A simple yet powerful notepad with HTML5 support and more