It's pretty easy to make your own, too. I use the element zapper and picker to block Reddit's incessant demands that I use "new" reddit and get a "premium" membership. I also use it to block Facebook's "trending" bullshit.
Either an element zapper or a one click sticky-header killer should honestly be standard issue features in browsers nowadays. The web would be a miserable without them, especially on mobile.
In that case we could just match by the CSS rules' content - i.e. match all elements that have style X, Y, Z applied to them. That kind of arms race would be over real quick.
