Ad blocking has being in the tech news for a minute now. And all the popular kids from Chrome to Firefox to the Samsung Internet app all have this feature via third party extension with only the Opera Browser supporting this feature natively and now they're are bringing this feature to its most popular browser, the Opera Mini (the beta version at the moment).
The Ad blocking can enabled from the data savings page.
So far, the ad blocking is a bit hit and miss in the High Savings mode but works every time in Extreme Savings mode shown below.
To download the Opera Mini beta update you should head over to APKmirror to get it.