A friend had a really cool idea for a Chrome/Firefox extension, but we're having trouble finding someone to help write it.

The idea is for an extension to put custom links or icons on the bookmark bar, and, if you drag an image, video, or link to that icon, it would automatically save that content to a specified directory.

Can anyone help by making this? Or, does anyone know of an extension that already exists for this? We're not looking for something like DownloadThemAll, just something that can be used with one image or video at a time.