Does not work on high resolution videos. 144p and 240p will download but for hi-res videos need an "ultimate" version of the software which you have to pay for and install separately.

Does not work with new Youtube!

It detects videos but won't the download button does nothing. I'm not installing the extra add-on in the hope that fixes it.

wouldn't let me download until I downloaded another thing, yet another addon that tricks you

The extension never installs, never shows up in my add-ons. If I could give it zero stars, I would.

For years, this add-on has required an additional program to installed. No problem. But the program has never installed. Not once. Not for several years. This add-on does not work, has not worked and probably never will work.

It asks for money to do anything.

Anyway I would never install it in my main browser, because its code is secret and it can see all my passwords and other things that I write.

See:

https://support.mozilla.org/en-US/kb/permission-request-messages-firefox-extensions#w_access-your-data-for-all-websites

"The extension can read the content of any web page you visit as well as data you enter into those web pages, such as usernames and passwords."

Absolute rubbish. Does not work until you pay.

Doesn't work with YouTube -at all.

Looks more like advertisement for a windows app than an actual video downloader. Can't even do youtube...

can't downlaod from vimeo, video divided into too many 1mb small videos.