Blocking the library/request can also be caused by your Security Suites Webprotection.
The javascript miner is in no way malicious but it was secretly embedded in a lot of websites or even browser extensions without notifying it's users, therefore Security Suites started outright blocking it. In the future there will be a forced opt-in to prevent this. Preview
Coinhive offers a JavaScript miner for the Monero Blockchain (CryptoCurrency like BitCoin) that can be embedded in a website. The miner is run directly in your Browser and mines XMR as an alternative form of support instead of donating money.
This miner uses your CPU. By increasing or decreasing the Threads you are using more or less of your CPUs cores and by changing the Speed you can adjust every cores utilization. You can check the actual CPU usage of this miner by looking at your Windows Task Manager or your Browser's Task Manager, for example in Chrome.