How do I get rid of FBI scam browser pop up on LG G2?

It is only when I open my browser. I've looked up several supposed ways to uninstall but I do not see anything installed that's not supposed to be there. I restarted in safe mode and can't run my anti virus program. I deleted a file that began with mp4 that was downloaded when it happened. I don't know the rest of the extension because I was trying to get it off my phone asap.

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