The problem is that my browser becomes stuck, completely, when I use VPN addon. I was using ZenMate to unblock several pages(block by country), and it happened for a month(was fixing itself somehow). But right now browser gets unresponsible completely. New tabs with different websites or about:healthreport do not work. Only way is to close the browser and open again. I tried to reset it, uninstall it. Only AdBlock and Hoxx VPN Proxy are installed atm.