As VPN is working, but RAM usage too high idk why. My PC have 8 GB RAM and over 10-20 tabs open subprocess of this extension consume over 4GB, sometimes over to freeze of OS or PC. How I figure out it: analize memory usage report in about:memory and extensions debug menu, then check pid in task manager. After deleting extension RAM usage by Firefox drop from 3.8GB to 0.8GB.