Delete wharkike.com browser
I prefer duckduckgo or others
Would you try this please :
Go to the Firefox menu (≡) => Add-ons => Extensions
and remove anything that looks unfamiliar or suspicious.
Next step : run malwarescans - further information can be found in this article :
Run most or all of the listed malware scanners
They all work differently - what one program doesn't pick up, the other might.
Also see :
Especially for Mac :
Any luck ?