This extension will help you to search your screenshots, easily with just few steps.
Its easy to use screenshot search extension, all you have to do is:
1- Print screen the area you want to search.
2- Crop it.
3- Press enter.
The image will be uploaded to a server where Google can find it then you will be redirected to Google search results page.
Please rate the extension after you try it.
for more details visit : http://urgueo.com/screenshots/