You can see the list of blocked URLs in the options page.
Moreover, you can edit this list to add or remove desired items. Badge icon color will also change to adapt bitcoin website scripts to the new state.
Red icon is when the addon is active and Grey icon is for the inactive state. When you are browsing internet, the addon constantly monitors websites for containing coin miming scripts.
Once a script is detected, it instantly blocks it from loading in your browser. This way, no website can use your computer resources to mine digital currencies. There are some companies that offer crypto-currency mining tools for embedding in websites.
When you are visiting a website with crypto-currency mining tool, it uses the resources in your system PC, MAC or Linux to mine cryptocoin and earn some digital currencies. The more time you spend on these websites, the more digital currencies will be generated. There are several ways to prevent websites from mining coins using your browser.
The first and the easiest one is using - Block Coin Miners - addon which does the job seamlessly for you. Note: in order to report bugs, please fill the bug report form in the addon homepage. Értékelje a tapasztalatait.