Hi there and welcome
this is correct, its an infection Alby.
As the first step to try to remove this, do the below in firefox
Then tell me if its cleared please.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
It is there, you missed the step to click Help the ? first