This extension is an excellent reverse image search tool that not only combines all the major RI search engines (google, tinyeye, bing, etc.) into a very helpful & convenient context menu action like most similar extensions, however this one has a number of additional subtle yet extremely useful features or tweaks that make it really stand out from the other extensions I've tried. E.g. the "Search by Image" sub-menu in the context menu allows you to right click on an image & choose which RI search engine you want to use or to use all of them which is nice; clicking on the extension toolbar button opens a pop-up bubble that has the same option to choose which SE to use but all adds in the top right corner the ability to control which image you want to search via 4 different options: select, select & upload (not sure how the first 2 are different though I assume the exact method of image extraction/how it's searched must be slightly different), upload-- opens a new tab where you can either drab & drop/paste, or browse for local files to use, & URL -- paste any image's url address to RI search. So far it seems to always work perfectly, looks clean & compact, & is small/efficient in terms of resources used. It's absolutely great for finding higher resolutions of images, to discover the video a screenshot/still originated from, figure out who/what/where, find other images in a gallery or get similar content/visuals, & many other research purposes. Definitely a must have extension! 5 Stars!