Are there actually fire resistance potions?

In real life? No, sorry.

If you mean a thing you drink to let you jump into burning-hot magma, in order to get into a hidden cave, then no. But you could try becoming a fireman, they have suits that stop them from getting burned, close enough?

Don't know dear. If your are a smart phone user, install Number one protected application, LEO Privacy Guard. Also Stylish themes to decorate your lock screen.