Não entendo porque o Firefox não coloca essa função nativamente no navegador. Boa extensão.

Great way to search for images or to find out where a image came from. i bet you be surprised to find out that most images came from different sources. some was stolen.

This extension has been great, but one unfortunate change is that ever since Google updated its image search framework, searching via Google Image Search hasn't worked properly - an attempted search just goes to the Google Image Search homepage, but doesn't actually pass through the image or perform the search.