Absolutely rubbish software!!! Stay away from this. Need to pay extra even just to save a converted file. Isn't this is what the extension supposedly do?! What's the point of converting the video when I cannot save it...
"The easy way to download and convert Web videos from hundreds of YouTube-like sites." They forgotten to add this note: "And we need charge you before you can use the features"

bs bs bs! SCAMWARE. Click bait that merely leads to another required download.

Update Dec-2024. Now they SPLAT a huge watermark taking up 1/6 of the screen ruining your download. Why use their tool if it ruins your downloads? Developers are bonkers. They also hassle you for $30.00 to remove this. You can pick other downloaders.
There are firefox add-ons that are not this intrusive and do not require $30.00US to remove. Look elsewhere.

Do not install this rubbish. Adds horrible barcode to video. Unwatchable! Uninstalled!!!!

Requires an additional app and you have to pay to remove a watermark and may be to listen the audio because my downloaded videos are mute. Why it not clear from the beginning that it is not free?

It was great until it started nagging about this goddamn companion app.
You can take your fucking companion app and shove it up your ass.
Uninstall.

My first (& last) download was damaged because I was'nt registered! You didn't have to force me to register! If it was a good app, I would come for more....

Only detects 5 out of 63 videos in a YouTube playlist. Confirmed useless cos other video downloaders detected all 63.
WTF?

useless, doesn't do anything but asks to install additional program.

夥伴軟體用人家開放源碼的東西來營利，感覺不是很好。

以前都很正常，現在都會卡住+閃退 >"<
且閃退是自動關瀏覽器!!!

Suspicious companion app required... Watermark added to downloaded video.

please update

This add-on actually can *not* save videos. In order to save a video, it asks for downloading a 'companion' app, which is an executable that has to be installed separately and hence the browser security restrictions do not apply to it - it can do virtually anything.
This is highly suspicious, because external applications are not necessary in order to save files. I removed it and installed a different video downloader add-on which can save files just fine without 'companion' executables.
Another suspicious thing is that this addon requires some permissions which are not needed for the functionality it provides.

I want an addon that does exactly one thing, download videos. This addon used to do this, but now they have started to run videos through some kind of converter (= slow) and leaving a big watermark on the video, asking for money to remove it. Completely useless, uninstalled.

Works really well in theory, but as others have said before, it puts a huge watermark on the downloaded video, then asks you to buy a "premium" version without that anti-feature.
The add-on does not tell you that beforehand, not even in the description! Downloading a video can take a long time so it is deliberately wasting your time just to increase the chances of you paying for it. I call this misleading and a shady business practice.

Why does it need all these autorisations: Access to your data for ALL websites, exchange messages with OTHER programs than Firefox, consult and modify the history of downloads, access Firefox activity while browsing Internet.

this app asks for way too many access permissions. Check carefully before accepting them.

also places a huge, intrusive QR code "watermark" on top of the content

Не работает!
Просит скачать дополнительные приложения!
После скачивания дополнительных приложений, конвертирует видео с водяным знаком!!!
Для возможности получить видео без ВСТРОЕННОЙ РЕКЛАМЫ требует заплатить 28$ !!!!!!!!!!!!

ВЫ ТАМ ЕБАНУЛИСЬ В КРАЙ ????????????!!!!!!!!

I previously gave this ad-on high marks.
Now it unfortunately no longer works with Firefox as it did before.
There may be ways to get it to function, but I don't have the time or interest.
If making this software comply with Firefox requirements isn't worth it for the developer I simply have to agree and move on to the next download option.
It was great while it lasted.