If it's adware, it's most likely not in your browser stuff. Or anyway.
I can't find it now, it's been advised a few times on such issues - to sweep your system thoroughly and additionally, use some online service(s) to undertake a more specialised sweep.
Others advised on somehow adjusting your launch command - I'm an idiot. It was said though you wouldn't see that thing on your browser while the bug might likely to remain on your system still.
So first, make a thorough sweep with what you have.
Then I guess, others'll come tell you more, meanwhile...🙂