Does not work

Działa ale za FullHD chcą kasę.

it didnt work for me,
hope to fix at the next updates

Doesn't offer 1080p separate video/audio downloads which decent players can work with fine. Instead, requires a premium account to "convert" them.

Since it wants money....

Videos can not be saved in their nativ Resolution, if the Resolution ist different from 144, 360, 720 or 1080. For example: 480p-Videos can only be saved in 360p format.
Videos lassen sich nicht in ihrer nativen Auflösung speichern, wenn diese nicht 144, 360, 720 oder 1080 ist. Bspw. lassen sich 480p-Videos nur im Format 360p speichern.

*Yet another* downloader by programmers too clueless to realise the converter for videos I want to download can run on my powerful PC instead of their servers they have to pay for. m( Or, maybe they're too savvy; maybe they make a nice profit from charging for the use of their servers. I miss the genuine free software of the '00s. If it exists any more, it's impossible to find amist all this GREEDSPAM! ;.; At any rate, it's not evil; the description clearly states payment is required, so it gets 2 stars. (I have tried a worse downloader today.)

Might work, but requires you to buy a pro version to download any videos.

360P only

В связи с политикой Youtube это расширение потеряло всякий смысл для free use: для сохранения в режиме 360р/128KB/s достаточно хорошо себя зарекомендовавшего и более универсального Ant Video Downloader.