TinEye is a reverse image search engine. The extension adds a context menu item so you can search for an image to find out where it came from, how it is being used, if modified versions of the image exist, or to find higher resolution versions.
Image Search Options provides a set of highly customizable reverse image search context menu options.
Dark YouTube theme - apply Black Youtube & Facebook Skin. Dark YouTube theme protects eyes by changing Youtube & FB colors to black
Google Reverse Image Search The only add-on in this category capable of searching local files from the computer
Tons of features to improve your user experience on YouTube™.
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.*
Reverse image search using various search engines, such as Google, Bing, Yandex, Baidu and TinEye.
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.
Listen to live radio stations from around the world!
Save the things you find on the Web to Pinterest.
Download every YouTube video you want and you can download them as MP4, WEBM, 3GP formats. Easy & Fast!
One Click to download any video from Youtube. Compatible with new FireFox Quantum 57+