Does not work in Firefox 115.0.2, Ubuntu 20.04

[sdbbs]

Just tried this extension in Firefox 115.0.2, Ubuntu 20.04 and I do not think that it works - I tried opening first video that popped on my front page today, https://www.youtube.com/watch?v=dcvLUZ2TQF4 and got this (that is, nothing - no streams are detected):

As it is hinted on the screenshot, the second tab has VLC web interface open (localhost:8080) - however, I had to specify a password (as explained in https://github.com/azrafe7/vlc4youtube/blob/master/instructions/how-to-enable-vlc-web-interface.md), and I cannot find anywhere in this extension settings where to enter a password?

Are there some other installation requirements, maybe? How can I check for errors? I tried "press v to hack | debug", nothing happens?!