mozilla download helper add on

so this is great. you can go to most streaming sites, youtube of course mainly and you can download the videos as mp4 with a click of a button.

haven't these types of add-ons been available for a long time. or is it the fact that it saves to mp4 that's good?

i used to use a site to do the same thing. this is way easier. don't know if it's jazz

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