This plugin was always hit-or-miss and frequently stopped working with Twitch changes, but it was always back up to ~75% success shortly after.

Now it has been months and it hasn't worked to block a single ad. It blocks the whole stream and video never loads. Video never plays until you disable and reload. On any level of proxy use.

I think either the proxy host got wise and blocked access, or it's Twitch's streams, or who knows. But this doesn't work anymore.