?? WTF ?? Puntuado con 3 de 5 estrellas

Using FF 16 x release. 1. tried to download this addon 6 X. Does NOT install. Does not appear in toolbar, or context menu, in addon list, or customize options. Nothing. Used this years ago and it worked fine. TOTAL FAIL this time! Ant vid dowloader did work. Anyone know how to get this actually working?

Esta valoración es de una versión anterior del complemento (4.9.11). 

If DownloadHelper does not appear in the list of installed add-ons, it is simply not installed. And it's not DownloadHelper's fault: we do not auto-uninstall our addon.