Pick a different add-on.
I have used an older version of Video DownloadHelper for years.
I got a new laptop (with windows 11), installed firefox and Video DownloadHelper.
This new version doesn't do anything other than telling you that it requires a companion application.
Shame on Video DownloadHelper for doing this.

Need to install other program and also the download and rendering process is super slow

Ne fonctionne plus : demande l'installation de compagnion,même si celui-ci a été installé

Very good! It is easy to use.

Won't really download much anymore. The "add on companion app" is clearly a scam or virus because it doesn't actually work. This should be removed from the Add-Ons store.

Whenever you try to download a youtube video it ask for companion app and when you install it, it ask to get a license. This is really annoying

Nach Update am 01.Juni 22 defekt!

Short version: They now add a QR Code watermark to your downloads so you'd pay for their software

Used to be the best, now you'll notice some "downloads" are slower, that's because it's actually downloading, then adding a QR Code, frame-by-frame, to your downloaded video, because now they decided that they will add the QR Code as a watermark to get you to pay for their convertor. Don't believe me? Hop on Youtube right now and try it. It used to be a very simple downloader as is, now it's unusable. Unusable unless you pay.

Doesn't work. Requires separate desktop app installation that doesnt open on Mac even after allowing it on OS level.

Don't download: add qr code to the video and requires additional software installation and spends your CPU cycles to add an annoying QR code

This extension flat out DOES NOT WORK. It asks you to install an external application, where the "install" button to install said application does absolutely nothing.

Requires companion app for the last few years. Unnecessarily resource intensive.

Is this fake? Installed and does not appear at all even after rebooting.

adding a watermark does not seem like a good idea to me I have a slow pc and I have to wait for it to download and wait for them to put the QR as a watermark.

Memory Leak recently (20GB Ram usage even when closing everything), sporadic high CPU usage for no reason, sometimes 30% on an modern 8-core CPU, again even when closing all tabs besides an empty tab (the extension wasnt used or opened at all in either of those situations). Firefox performance analyzer clearly showed it was coming from this extension.
Besides that, the user interface is clunky and doesnt work correctly if the extension icon is moved into the dropdown menu.

Watermarks videos unless you pay.