An unexpected advert link.

Good-day Sir/Ma, recently my Firefox browser was having problem and I uninstall it and I download and install another one, and I started using it to browse, and in my browsing I was experiencing what I was not experience before, I started seeing some popup link advert on my computer, I don't know the language I can use for it but hope somebody will understand me, so please I need somebody to help out, thank you.