For 1080p and higher, it can download only video without sound, and separately the audio.

According to:
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https://support.mozilla.org/en-US/kb/permission-request-messages-firefox-extensions#w_access-your-data-for-all-websites

The extension can read the content of any web page you visit as well as data you enter into those web pages, such as usernames and passwords.
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According to:

https://securitywithsam.com/2019/07/dataspii-leak-via-browser-extensions/

this is spyware.

some times it delete the file and re-download it.. it cost me a lot of data.. please fix it soon..i can't remember if it happen with all types but im sure it happen with opus files..please fix it.. thank you.

Перестал скачивать музыку из VK. При наведении на кнопку скачивания вместо битрейта пишется "Не удалось определить размер файла. Попробуйте повторить попытку" При нажатии на кнопку скачивания, ничего не происходит.

Youtube have blocked all Addons and third party players as of september 2019..
VLC & Smplayer and so on are all blocked from using URLs to play youtube direct they require a remixer site first.
This plug in is also Blocked from finding URls from youtube when on native youtube site...
But the script on the savefrom.net site is not currently blocked...

On youtube NO links will be found on the drop down download menu as currently youtube are still blocking this extension...

COOL

Перестал качать с ютьюба , пишет "Не удалось найти ссылку"... Очень жаль, хорошее дополнение было , придётся пользоваться сторонним дополнением SaveFromYouTube.