Дополнение не является полностью бесплатным. Бесплатный доступ фактически представляет собой пробную версию примерно на 51 скачивание, после чего для продолжения требуется PRO. При этом ограничение количества скачиваний заранее явно не указано в верхней части описания дополнения.
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The extension is not completely free. The free access is essentially a trial limited to about 51 downloads, after which you need to upgrade to PRO to continue using it. However, this download limit is not clearly disclosed at the top of the extension’s description.

The stupid extension stopped working and keeps telling me about a free limit and stuff. This was never mentioned on the page I installed it from, thanks so much for that unpleasant BS surprise there.

I'm surprised by this different ratings. Throw in mine: just doesn't work. Between "Initialize 0%" and "any (exactly: any) permission is missing, please reinstall" you get stuck. Even for the obscure error messages the thing deserves 0 stars.

Nagware

Used to love this, but now supposedly they lost all their legacy user files so now you're forced to buy a PRO membership again. This was promised to be forever, now suddenly it's not?

asks you to pay after a while, and cant choose download location for files

it paywalls you after 51 uses, pure greed

Stops working and forcefully tells you to donate to continue using it.

Max videos u can download is 51

install, start, ersten testsound geladen und - in absolut vorbildlicher und dem zweck entsprechender funktionalität, ohne sinnlos iwo "mehr" zu versprechen oder wollen.
- witziger fand es vor zeiten mit dem "kummerkasten" oder "beschwerdebox". niemand nicht extrem gelangweilt wartend im kkh kreissaal wartebereich hätte nach erfolgreicher anmeldung UND ablieferung der gebähr-willigen, seine angemessene bewunderung zur grundfunktion ausgerechnet im kummerkasten versenkt! der war für rotztücher und kaugummipapier...ohne sternchen,häkchen cookiefallen usw..
oh obwohl! muss direkt meiner mum ein anerkennend dank&gruß senden - ob des FANTASTISCHEN wurfs und nach angemessener testphase!! fast 50jahre..naja, is auch tot nu der briefkasten...
UND DER HiER AUCH! asta und pasta, lastma mich in ruhe!

und sterne sind aus! vom himmel gefallen, im moment meiner geburt. erwartungsgemäß. gab dann eeewig nur noch stern-nudeln, stern-zwirn für alle.. den rest verscherbelt, ging nach stu'gart oder sowas...wer braucht die????

It was working just fine for a few years, but suddenly it says "You’ve reached your free high‑quality trial. Upgrade to PRO for instant & unlimited 720p/1080p video and 256/128 Kbps MP3 downloads." I only recently started downloading videos in 720P quality (I didn't needed it before, as I used to download music and didn't needed the view to be in high quality). I downloaded 55 videos and I didn't know there was any limit or trial. I've checked the addon website a few times already, but I can't find any clear information that to download videos in 720P quality and higher you have to buy a PRO version. I was a big enthusiast of this addon, but now I feel cheated. I'm very dissapointed.

Not work

You have to donate every year

After i pay for pro version, there is no possible to download video from youtube...

Paywall bullshit. There are FAR too many free alternative that work just as well, or better, to be paying for this. The author must be a bit daft.

Suddenly makes you pay to keep downloading videos out of nowhere

there is a limit to how many videos you can download before it pay walls you. 51.