Requires a companion app.
Deleted.

no descarga videos de yotube

Useless crap...

This used to be a useful extension but, following Firefox changes, they introduced a companion app. That was ok for a while but now they are just trying to make money. For the last few weeks, the companion app hides downloads that the free add-on would normally show (and other download apps still show) to try and force you to then pay to remove the watermark it adds to the download (that shouldn't need the companion app at all). I proved this by uninstalling the companion app, re-starting Firefox and then the free add-in showed all the video formats again. Problems with the video? No, I ran the test it on VDH's own advertising video on YouTube! The companion app is now hijackware just to try and make money.

They add their QR code in video. Terrible.

Perhaps the extension I'm using (VdhCoApp 1.2.4) isn't registered, but the video output of what was a 1080p video seems terrible and blocky. I can't tell the difference between the 1080p version and the 320p outputs, in either wmv, webm or mp4.

Video Downloadhelper places a bar-code directly in your video in order to convince you to purchase a registered version. This bar-code links you directly to the Video Downloadhelper page. While, I do understand that it does cost money to provide video downloading and video converting services, I strongly reject the idea that its users are not informed a head of the addition to Firefox. Please be considerate of other people and respect their time.

Before it was great now it just make you to download additional file just for medium res or high res and it doesn't even work.

DownloadHelper prompts to download additional pkg file (for certain video types) on a Mac which tries to install OSX.Bella trojan :(

Did not work for other websites. It could not find content.

Failed aggregating files...

Was good, but now they are only after the money! Now you need a shitty 3th party app for youtube or they put QR watermark on top of the video. Thanks for ruining a good app!

Программа полное гавно - ничего толком скачать не может. При закачке теряет источник каждые 30 секунд. Вы больше нервов положите, чем что-нибудь скачаете этой программой. Не пользуйтесь ни в коем случае этим ГАВНОМ!

I don't like your license. no! I totally hate it...

it requires a companion app

下载视频要合作软件，下载一个几分钟的视频下载完毕要合成一个多小时。

What is this 30 dollar charge for watermark shiz? Why be free then suddenly decide to charge money?

fcking sh!t

Can't download without companion app, external site, executable file. Get fucked.

Used to be the best. Now it downloads in a fair amount of time, then says it is going to take an hour+ to aggregate a 9.5 minute youtube video which is a still screen and music. If you cancel the aggregating, you lose it all, and I can find no way to stop it. All this since the companion app requirement although you can go without but the downloading seems to have been capped further then.
I'll find something else now.

Came back a year later and it has improved in time it takes and still tells me it requires a companion app, however, now there is a huge QR code all through the video. Is there a point?

Installs a big QR code on screen of all downloads. Spoils functionality.

Tried it out, but unfortunately it takes forever to download small files and uses a huge QR code in the corner of the screen to extort you to buy a license. I found and donated to an alternative software that doesn't do this. Thanks anyways.