Challenges.cloudflare.com popup frustration

While viewing a video in full screen using Firefox, I have this annoying “flash” in the lower left corner every ten seconds which simply says “challenges.cloudfare.com”.

A major distraction/annoyance.

I figured out that I could disable javascript after the video starts to keep this from happening, but that isn’t a solution.

How can I simply filter this out without breaking websites? Is this a Firefox issue? A Cloudflare issue? An issue with the video provider? Thank you!

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