This is a transitional dummy package to ease the migration from the flashgot to the new xul-ext-flashgot package. You can remove it safely.
xul-ext-flashgot | Turns every supported download manager into a download manager for Firefox | Mehr ...
FlashGot offers also a Build Gallery functionality which helps to synthetize full media galleries in one page, from serial contents originally scattered on several pages, for easy and fast "download all".