As you probably know, some websites use browser miners. They are great alternatives to ads but some websites abuse the service to mine during the entire browsing session.
While I was surfing on GitHub, I found a project that blocks browser miners: No Coin!
No Coin is a browser addon which allows you to block browser miners. For now, it isn't that advanced and it doesn't block every miner but it is still being developed.
You can find this extension from:
GitHubChrome Web StoreFirefox Add-OnsOpera Add-OnsMore information:
https://ker.af/stop-coin-mining-in-the-browser-with-no-coin/