Select some text, right-click and choose"Search image" in the menu, a Google Image tab will open with your results.
Enlarge thumbnails, and show images/videos from links with a mouse hover.
Capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and text, blur sensitive info, one-click upload to share. And more!
Grab and download media (image, audio, and video) resources by monitoring network (like FlashGot or Flash video downloader extensions)
瞬间过滤B站(bilibili.com)刷屏的相似弹幕，还你清爽的弹幕视频体验。 *a tweak for a Chinese website. Please ignore this add-on if you are not a user of bilibili.com.*
Tons of features to improve your user experience on YouTube™.
Adds a volume slider to Bandcamp album pages on bandcamp.com.
The entire page will be fading to dark, so you can watch the videos as if you were in the cinema. Works for YouTube™ and Beyond. It works for all known video sites such as YouTube, Vimeo, Twitch, Dailymotion, Facebook, Hulu, Metacafe, YouKu, etc.
Open and download links in IDM (Internet Download Manager) easily
Forces 1080p playback for Netflix. Source: https://github.com/vladikoff/netflix-1080p-firefox#with-extension Based on https://github.com/truedread/netflix-1080p Chrome Extension
Vid to Mp3 is fast Firefox Addon for Downloading Youtube Videos and Convert to Mp3/Mp4/AVI/3GP and other audio/video format.
Wtyczka pozwala oglądać wiele filmów i seriali bezpośrednio w serwisie Filmweb.