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It's downloading 1080p from YouTube (lastest atm 5.0.3).
Make sure You've installed FFmpeg and put a right path in CYTS options (Firefox reboot required). "Save as" should become MP4 instead of MP4V.4 stars for not being able to customize filename.

Reboot:
in my case, options will be updated immediately but save as mp4 function will not work properly until FF rebooted
Suggestion:
1) add a "show only best quality available" checkbox with priority order list (like i need only 1080p will be shown if it's available, 480p if not)
2) add a naming template
Bug:
1) If there is no available options for download (like selected only 1080p but YT video is 720p) popup still appear but it's empty
2) if there is only 1 option to download in popup menu - scroll arrows still there

Это отзыв для предыдущей версии этого дополнения (4.4.4.1-signed). 

Thanks for your thoughtful review! Just one correction: Firefox does not need to be restarted, CYS menus/Options will include FFmpeg-only features immediately once you set up the correct path to the FFmpeg executable - this was a regression fixed in v5.0.6.

Please, send us details of your feature request in an email to our support address, and we will look into it. Thanks again!