made youtube videos unplayable

Allows you to download ONCE and then every video afterward will require you to install a third party application - even if you go to download the same video again, demonstrating that it's not just a certain type of video that requires the "companion application"

This screams malware.

Para descargart cualquier video pide instalar una "aplicación auxiliar" sin esa aplicación auxiliar no se puede descargar ni reporducir nada. Buscaré otro complemento que realmente sirva.

Descargaba muy bien y sin problemas hasta que me pidieron dinero y como no dí me da muchos problemas y no puedo descargar muchos de los vídeos. O ES GRATIS O ES DE PAGO.

DO NOT USE. Absolute scam. Requires you to install their software (could be a virus), took a long time to download, and then had a massive QR code in the corner... the only way to remove the code is to pay them. Use another addon or just use the online video downloaders.

Simply does not work.
After installation I tried to download a video from YT (a free video; no music; no film; etc.). DownloadHelper asked me to install a companion file. After some research and re-thinking I pressed the button and there was -- nothing. An error message appeared (from github) that there was no such a repository.
So, that's it for me: I uninstalled this add-on.

下载的视频没有声音

Used to be great..now is terrible. The companion app constantly needs updating; however it never lets you know. The aggregating is a HUGE problem; it take hours to do this!! FIREFOX; please recommend another BETTER app!!

This extension is not working with latest Firefox version.

podre. precisa de um app adicional pra baixar videos. demora horrores pra um video de 50 minutos. Não recomendo. Procure um software mais confiável e eficiente, pois esse é inútil

QR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR codeQR code FU!!2!!!@!!

does not show up anywhere after installing it so no way to use it = CRAP

They put a QR in the corner of every videos that you download with it.

this barely works, and its supper suspicious. NOT Recommended; proceed with caution!!!

WARNING - Payment required for proper use. -- Otherwise: Not easy to use, the forum/support is not a nice place, and says it is downloading at a quality that it clearly upscales to after the effect.

Ive been using this addons for very long time. Last time i had no issue with the downloads. But recently im facing issue whereby it says "Unknown time left" and then proceed to failed. I had tried many things. Blocking of firewall, restart my adapter, reinstalling firefox and addons, adjust the download settings and many more. But seems like it keep prompting this error. At first the download speed increase. Then it gets slowly and stopped. I had to click the retry button over and over again countless time just hoping it would work.