I'm not sure it's even possible to do this on a proxy any more since so many sites do client-side rendering now. You'd have to run the Javascript, see what crap

I'm not sure it's even possible to do this on a proxy any more since so many sites do client-side rendering now. You'd have to run the Javascript, see what crap it produces, figure out what Javascript generated the crap, and remove that Javascript. Sounds dangerously close to solving the halting problem. (I presume ublock can do these things because it's sitting at the rendering engine. Proxies don't have that luxury.)