It is not exactly Google Chrome only, you can run it in any Chromium based browser such as Opera, Yandex, Vivaldi, etc... And I do also have plans to port the e

It is not exactly Google Chrome only, you can run it in any Chromium based browser such as Opera, Yandex, Vivaldi, etc... And I do also have plans to port the extension to FireFox (I haven't read their docs yet but I guess it shouldn't be too hard). Regarding the custom list for an adblocker, as said in other comments, the idea was to keep it separate from adblocking. Coin mining in the browser is a different issue. Where ads are tracking you and visually interfering with your browsing experience, coin mining, if abused, is eating your computer ressources resulting in slow downs (from high CPU usage) and excessive power consumption. You might be OK with that and not with ads, or vice versa. Or you might just want to keep ads blocked entirely and just enable the coin mining script for a minute to pass a Captcha. That's why I believe having a separate extension is useful.