Merriam-Webster's Learner's Dictionary
Look up any word you want while browsing the Internet. Double-click the word to get its definition, pronunciation, and usage examples in a text box appearing on the same page.
542 users
flashvideotohtml5
自动转换优酷视频的Flash站外引用代码到Html5,用于移动端播放。
99 users
Tab Deque
This add-on is for you if you miss the behaviour of your computer's window manager/taskbar in your browser. It remembers the order tabs are opened and focused so when closing or minimizing a tab the previously active one gets the focus.
234 users
timimi
Firefox addon to save and backup Tiddlywiki. Requires installation of native host.
610 users
8 users
123 users
338 users
226 users
213 users
18 users
Tree Style Tab
Show tabs like a tree.
209,897 users
607 users
130 users
3 users
SoundCloud Downloader
Directly download tracks on soundcloud.com. Creates metadata tags for Title, Artists, Album & Artwork. Allows to block reposts in your Stream feed and more.
11,871 users
765 users
Code Injector
Inject code into websites! (JavaScript, CSS, HTML and Files)
2,123 users
269 users
41 users
Dark Reader
Dark mode for every website. Take care of your eyes, use dark theme for night and daily browsing.
1,158,716 users
1,226 users
Canadian English Dictionary
For some reason, Mozilla doesn't have a Canadian localization team, but I know that even the British dictionary doesn't quite cut it for the truly patriotic.
28,279 users
291 users
Gradientus
Gradientus is a dynamic theme for Firefox Quantum that changes colors automatically based on time of day.
23 users