I've been hacking on uMatrix for my own purposes, and in the process I've found some bits of code that I'm 99% sure are useless. I'd like to submit a PR to remove them, but you seem to have forbidden that, which... well, your loss, I guess? But just in case you would find this particular contribution valuable, here's a link to my cleaning commits if you want to merge these yourself: gorhill/uMatrix@master...rhendric:cleaning