Does what it says it does, by disabling javascript. However, even clicking the button to turn the add-on off did not do so. I have to go into the add-on page and disable it entirely to get javascript working again. So this is kinda useless right now since I need javascript for most sites

I looked at the source of various miner blockers, and it looks like "No Coin" does the best job of keeping its blacklist up to date.