This story of images occasionally pops up on opening new links in Chrome. These links are for legitimate websites such as imgur and reddit. When it happens, I'm on mobile data. When I choose the tab, and click the link again, no pop-up appears.
Here's the relevant portion from
Google Chrome 51.0.2704.81 (Official Build) (32-bit)
OS Android 6.0.1; E5823 Build/32.2.A.0.224
This is a screenshot of the pop-up:
How do I find out what caused this, and how do I fix it?
It happened again, this time without clicking a link. I was in reddit, it just popped up.
Here's the pages without the pop-up:
When I try to click back, I get to this page:
Which is something about appflood security. I haven't managed to teach it down to anything though.