tl;dr: 3rd party app installers req'd by this extension fails malware test on virustotal dawt com
Dev is very vocally frustrated about their OSS extension flagging spuriously in VirusTotal.
TO BE CLEAR: Their code is clean, if/when audited.
**The MAJOR problem is with their installers that are SUS AF.
**The solution: d/l their code and build it locally on your won machine, bypassing their sus installer apps.
**If you can't DIY, don't even think of installing on a machine you use for secure purposes like Banking.

Ahora te pide descargar una aplicación externa a firefox para poder funcionar... aléjense de esta extensión.

I download videos to play them back later using VLC and playing at double speed. This video download tool did not download videos with sufficient clarity to allow the double speed. When I speeded the playback up, the soundtrack was broken up. It would play for a few seconds, then stop for a few seconds, all the way through the video. The soundtrack had an intermittent clicking or popping sound at normal speed like it was barely keeping up. This extension could be a good tool if the soundtrack problem were corrected, but as it stands, it is not yet ready for prime time. FYI, I was downloading from a Kajabi storage site when I had this problem. The sample YouTube download you suggested in your installation process worked fine. Your extensive made me download an app from another vendor, MIG, to effect the download process. I don’t know if the problem came from your extension or that app, but they want $28.50 per year to use their software, and given this problem in downloading, I chose not to use or pay for the MIG app. Please let me know when you’ve corrected this, and I’ll try again.

Requires a companion app to do anything. Do not install this.

Ha dejado de funcionar, posiblemente el creador quiere que compres la licencia.

las versiones antiguas eran buenas, ahora las ultimas dañaron todo, para descargar un video salen un monton de opciones que no sirven, al menos salieran los tamaños de los videos para saber cual descargar

Used to be ok, now it doesn't work and they still ask money

Used to be good addon

Yeah, absolutely no one wants videos with watermarks added.

In order to actually be used, requires another program to be downloaded.

scam... it simply doesn't work unless you install an companion app on your computer, stay away form it

エラーだらけで全然使えない。詳細でもtxtにしかならなくて使い物にならない。

Ne fonctionne plus avec YouTube + Licence payé qui n'est plus valide

pay , or choose other solutions

Since a Firefox update to 116.0.3 (64-Bit), Downloadhelper doesn't wworks more. Very sad. Now I use the free Mediahuman without problems.

This extension used to work great for YouTube downloading. Now it hasn't worked in about a year. Supposedly it was fixed for a moment with version 8, but now it doesn't work again. Hoping that it gets updated and fixed, but I'm not optimistic after this long.

No I don't think I need external app to use this extension

I've owned and used for many years, usually with the companion app. Basically stopped working with YouTube over a year ago, but continued to work on a few other sites. Now as of Aug 2023, it gets nothing at all. I get messages about not being able to aggregate streams, regardless of video type or size I try to download. Definitely don't pay for this