Does not work. Probably would work if you purchased the companion software from their site to go with it, but not saying so in the add-on description is deceptive.

Sucked. Didn't work.

It says you can download up to 4k while you actually need a program to be installed for 1080p + videos.. Don't tell the plugin can do something it can't

A complete waste of time just does not work.

Compared with "Video DownloadHelper", far worse.

Please change those permissions, thank you!

This garbage doesn't work on FF 56!

Malhonnêteté avérée !
module en réalité payant ....

When I click on one of the green download buttons, nothing happens. For some videos. For others, it works fine.

Why absolutely nothing?? At least sho what's the matter. Maybe it's fixable from the user's end. A silent fail, where ab-so-lu-tely nothing happens, is just bonkers.

I downloaded the add-on based on popularity. It did not detect the video on twitter. Nor does it accept suggestions as to where the video frame is.
I suppose it is Windows oriented (I use it in linux).

Maybe a future update will resuscitate it, but right now, as other reviewers have noted, it just displays "No videos found. Why?"