No-Miner per Brandon T

This add-on blocks mining in your browser before it even starts. It does so by scanning Javascript files before they are loaded and rejecting them.

If you want to add a certain website as an exception, you can click on the plugin icon and add the website's domain (Regex/Regular-Expression pattern).

IE:

"google\.com" will add "google.com" to the exception list.
"google" will add all URL's that contain "google" to the exception list.
$google will add all URL's that begin with "google" to the exception list.