Google Image Search is a Firefox extension that allows you to just right click an image and have Google search the image for you. Google will bring up stuff like where on web is this image being used, visually similar images etc.
You can prefer to open the search tab in background or foreground.
Local images and images with data uri scheme are also supported.
Product's homepage
Requirements:
· Mozilla Firefox
What's New in This Release: [ read full changelog ]
· Added support for local files (url starting with file://)