Does nothing Rated 1 out of 5 stars

Using Firefox 3.5 and it still doesn't work -- nothing is downloaded.

Instructions are non-existent, but following those in the reviews here I did this:

1) Tools > Add-ons > Image Download > Preferences
2) Enter a Category, Browse to choose a download folder
3) Click "Add/Modify" (also tried "Save" -- neither one does anything)