How To Get Rid / Remove / Stop pop-up ad in Firefox [Solved?]

How to remove pop-up ad League of Angels

Are you currently suffering from that annoying pop-up ad, promoting an online game called League of Angels, that keeps coming out in your Firefox browser? This nasty pop-up ad started appearing a few days ago. I am not sure if this is a malware, adware or a virus, but it’s really annoying. What was …

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