Why does Chrome on Android launch tabs or redirect existing tabs to spammy ads (spontaneously, it seems)?
To build to what we know, I just saw this today on a stock Nexus6P (TMo) running the August update, only in 'ChromeBrowser'. Previously, it was happening to a roommate's unrooted Galaxy S4 (AT&amp;T), which now that I think about it, was running an even more current version of 'Chrome' than I was. No wifi, separate mobile networks. I updated in the past 24 hours and saw my first URI within an hour of googling this post and adding. The only websites I've used since the last boot have been Google, Wikipedia, Reddit, Amazon, and IMDB.

Tried clearing the system cache on both phones, uninstalling and reinstalling 'Chrome', running 'Malwarebytes' and 'Avast': still happens. Doesn't seem to be happening in 'Adblock Browser'.

If anyone can decipher the string that prompts mine, it looks like:

data:text/html;base64,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