I've been using Chrome browser on KitKat 4.4.4 with no issues on a Moto G.
However, of late I have noticed a strange advertisement pop-up window that comes up every now and then and doesn't let me browse properly. I've attached the screenshot here.
When I try to navigate away by either clicking "ok" or by using the back button on my phone, I am always taken to the website listed on this pop-up.
Earlier I had thought that this must be one of those advertisements on the website I was visiting, but now I wonder if this is something more serious - perhaps a virus ?
Looking out for your comments and solutions.