Ok. I guess, compiling it from sources is the only way, as there are no pre-compiled binaries anywhere. Unfortunately I don't have time for this now. And there is no guarantee, that I won't encounter more problems, such as disabled autoplay.
So I'll try new approach tomorrow. Just open URLs in external Firefox, I like much more, in "always open in same tab" + kiosk mode.
And establishing Comet server via nginx and updating page in realtime is way too hard, cuz I need this work to be done tomorrow. I don't want to deal with something like PHP for now.