This is amazing. It works fast with very few problems. I always wanted something like this for private use.

There is a new sheriff in town: https://addons.mozilla.org/sl/firefox/addon/search_by_image/.

Version 1.2.2 works well.
But I can't install the new version (1.3/1.3.1). FF (53.0.3 on Win7) tells me the addon file is corrupt.

More complete than "Image Search for Tineye", because it has the ability to search image AND the whole page. But I prefer "Image Search..." because I don't really need this feature.