I discovered that I can have Mullvad activated at the same time as ProtonVPN, while Proton is running from the Firefox extension. I’m on Linux.

When I look up my IP and location, the one that shows up is Proton’s, and Mullvad doesn’t detect itself on its website.

My questions are:

1. Are all my programs running through Mullvad, except Firefox?
2. Can websites get confused because of the conflicting information?
3. I was just playing around, but does this have any practical utility?

Thank you all in advance!