Rated 4 out of 5 stars

On some videos, like:
https://www.youtube.com/watch?v=b--FKHCFjOM
It loads randomly (sometime just spinning infinitely until settings opened).
Also it couldn't load info from page such as Author(channel name), Upload Date etc.

Bugtracker would be appreciated. (You could make a bugtracker on Github w/o code deployment)

This review is for a previous version of the add-on (5.6.26). 

"couldn't load info from page such as Author(channel name), Upload Date etc"

-Please install the latest version of CYS (v5.6.26), this should fix the problem (file naming). Also, if the throbber stops spinning and the list appears eventually, you might have a slow connection. Please contact us at cytsaver@hotmail.com, and let us know what OS, browser version and CYS version you are using. You can also create a new issue at cys.mantishub.com. Thanks for your review!

Rated 4 out of 5 stars

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

This review is for a previous version of the add-on (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!