I definitely do not care about such things enough to install a plug-in to see it.Somebody went to a decent amount of effort to analyzing and deconstructing the Youtube code for "likes". Either that, or it's an ex-Youtube employee. This may be a worthy plugin to install if it works.
I only watch some videos on YT nowadays. I have pretty much shut down my channels, since they deleted my P80 build videos and threatened me with deletion of my channels. Fuck'em. I also took down my popular (1.4MM views) driving technique video. Why help them, if they're not helping me? I didn't make a dime on the driving video. But I'm sure they did.