Host Grabber ++ от Rhadamanthe

This extension can download media files, including images from hosts like Imagebam and so on. It relies on an online dictionary, that indicates how to extract the links to download.

Downloads are performed in the default download folder. This is due to restrictions on the Firefox API that do not allow to specify another location on the disk.

Do not expect it to work with all the web sites or hosts.
However, feel free to contribute by submitting pull requests on Github.