How to stop my Android device from being spammed in the browser as well as in the application?

Recently I have downloaded two games: 1. Deer Hunter 2. PreHistoric Worm But after that I have my browser which keeps redirecting me to http://ad.adsmatte.com It is happening every time I load the page – after few seconds, it automatically gets redirected to this AdsMatte and doesn't go back to the previous page, even if I press the Back key. In an application like WebMd, when I load the app, after few seconds it is covered with a full screen ad whereas it used to display the options menu. This is blocking my view and I cannot see what is being displayed by the application. The WebMd app which is showing an "Update Your Browser" message with a "Install Now" link to Play Store (click image for larger variant) I don't have Opera and it still tells me to update my Opera browser. I closed the application and retried it, and again it is displayed with some "Warning your HM1S is affected with Virus" and starts vibrating. **Note:** Please avoid anything like this post suits well on MIUI/forum, I have already asked there and got a very immature answer as to disable Java Scripts even after seeing my below screenshot. [Update] I have tried using mobile data and now it does not redirect so it's more of the modern problem the app are clean