ads everywhere, where does it come from?

[Ilikecats]

I have no idea why but all of a sudden when I enter a page there is ads everywhere, banners and stuff (it has never been like this before). Pretty sure It's virus but I rarely download stuff actually, I have everything I need on my computer already so have no idea where it comes from..
How do I make it disappear, do I have to reinstall chrome? (there's no idea in using firefox because it's already the same there since a while back..)

[Kevin]

people

[Martin]

install, update, scan with Malwarebytes

u could try the Firefox add-on Adblock

[Felix Komuo]

check your browser installed plugging or pc installed program (software) you should see the unwanted advert application that is popin advert on your screen