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