It's not entirely clear to me that FB would have any right to ban the extension. They could attempt to keep users from using it through policies or detection, b

It's not entirely clear to me that FB would have any right to ban the extension. They could attempt to keep users from using it through policies or detection, but it's running by user choice on user computers in user browsers. I suspect in the US this would have been handled differently but loser pays against a company that can afford to inflate costs by millions per week to make an example....