Once in awhile one finds one's self presented with a lot of choices: Links to 100 MP3s of live performances by one's favorite band, or 250 high-res photos of kittens, or a pile of video files. You could go through each link, one by one, right-clicking and choosing Save As..., but you've got better things to do, and luckily there are free mass-downloading browser add-ons that will do the job for you.