TinEye Reverse Image Search to Firefox.
I have the
MyCroft search engine in my list of Firefox search engines at the top right-hand corner of Firefox. I selected the MyCroft search engine to search for TinEye in another Firefox new tab. I then choose the 2nd link under Other General Engines - Metasearch to left-click. That effectively added the TinEye search engine to my list of selectable Firefox search engines. I then selected Manage Search Engines to move the TinEye search engine from the end of the search engine list to its proper position alphabetically.
The way I suppose it works is to right-click on an image and select Copy Image Location - and then Paste that into the search engine search block, of course, in another Firefox New Tab.
You can alternatively visit
here, and simply add the Firefox plugin which adds a right-click option to search for an exact copy of an image.
Note: Using the MyCroft search engine is the easiest way to add additional search engines to Firefox - after you search for the MyCroft search engine at the above link to add to your search engines.
-- Tom