Yesterday I pointed out the Snissa Extension and I received some tips on other similar programs.
Screen Grab! does about the same thing, although it obviously does not post the image to Snissa’s web site. Its other options unclude just grabbing the visible portion of the page and grabbing the whole window similar to alt-Print Screen.
Cropper is another similar tool, yet very different. It is not a Firefox extension and is Windows only (requires .NET), but it will grab a picture of anything on the screen. Once activated you can have its box appear on the screen. You set its options for what kind of output you want and how you want it to handle certain aspects of the environment. You box in the area you need and fire. It will drop a jpg, bmp, png, or even a gif with the proper extension into the directory you selected. When the options are set you can just keep hitting Enter and it will send the image to the directory.
I have tested it in making screen grabs of security camera video. As long as you reduce the harware acceleration to at least half then you can use this tool to grab the image.



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