Google Widevine Firefox -

"It is if you are inside the lock's workshop," Firefox replied. "But I am not. Widevine is a secret. I can see it download a new version of itself—a piece of code called libwidevinecdm.so —but I cannot read its thoughts. Today, the new lock demands a newer, shinier 'sandbox' to sit in. My den has the old sandbox. So the lock refuses to turn."

Alex frowned. "Can't you just make a new sandbox?"

The lead nodded. By the end of the week, a new blueprint arrived at Firefox’s den. The lock was updated. The movies played again.

But from that day on, whenever Alex opened Firefox, they noticed a tiny, unofficial patch on the browser’s icon—a little keyhole with a fox’s paw reaching through. It wasn’t a real feature. It was just Alex’s imagination.