I use this addon to block annoying podcasts and other uploads from channels I usually like. It seems to work perfectly, including in the sub feed (I suspect the underlying requests rather than the page DOM are being filtered, but I haven't checked the source code). My only suggestions would be to add an option for tags, or to include a short "how-to" text on the options page itself without having to click through. Maybe even a quick Regex tutorial for newbies would be useful. Still, this addon gets the job done and causes no issues.