Incognito Plus! Search images, videos &&....
To use, simply highlight text on any web page and right-click. Click on the sub-menu named "INCOGNITO PLUS! SEARCH, IMAGES, VIDEOS &...." and choose from standard, images or videos to search Google.com's selected result types. Defaults to Google.com. This is the free version of the extension. The paid version (just 0.99 US) gives you the option to add up to 10 custom URLs you can search on and set your preferred Google Domain by default! See the options page for a link to the full, paid version!