Help unusual popups : virus ?

[AnAndroidUserAsking]

Hello.
I use an LG G4 I got for chrismas this year, and some time ago (maybe a month or two) I started to get some annoying popups (“you have a virus” type).
The more time goes the more popups I get. They appear on random websites that I could use without problems before, and even appear directly from the Facebook app sometimes (when browsing 9gag pages from the FB app for exemple). And once it pops up the only way out is to close the tab before it sends you to the appstore. This makes me think it could be some kind of virus. Screenshots here :

http://www.noelshack.com/2016-32-1470700312-screenshot-2016-08-09-01-43-16.png

http://www.noelshack.com/2016-32-1470700451-screenshot-2016-08-09-01-43-24.png

What do you guys think ? Could it be a virus or is it just a regular ad ? And how to stop it from happening ?

Thanks

 

[Member 1919122]

Use an ad blocker from the play store.

 

[JaronH]

Make sure you don't have any malicious apps. Apps you may have downloaded from sources other than Google Play, for example. This is the best way.

You can also run anti-viruses like Malwarebytes, but they don't always detect these kinds of things.