Good old Wikipedia gets a great new look
Select text and search from the context menu or a tiled popup using any of your installed search engines. Add new search engines with a right-click, edit favicons and query strings. POST compatible, simple UI, highly configurable. For FF 57+
Listen to live radio stations from around the world!
Save frequently-entered text for pasting later.
Tomato Clock is a simple browser extension for managing your productivity.
Block distracting websites when you are browsing the web. You can list websites that you don't want to visit in the settings. You can pause or turn off the blocker quickly. Completely open source.
擁有大量有趣的功能增進您的 YouTube™ 使用者體驗。
YouTube with more freedom
Lets you fix annoying sound problems in YouTube videos and such. Like audio in one channel only, too quiet or too loud. (Unfortunately, doesn't work on many other websites because of cross-domain issues — but it does work on YouTube.com!)