That’s just a made up fact by the TL;TR bot. In the linked source it just says "Chromium-based browsers including Chrome and Microsoft Edge. " Nothing about Firefox.

Questions 11, 12, and 20 we’re all graded incorrectly as the correct answer contradicts the specified source.

Based on the automatic grading I got 12 out of 20. Based on the feedback / comments I got 15 correct.

I’m quite proud that within the human photographies I classified 100% correct but I guess it’ll be impossible for me if the algorithms just improve a tiny little bit.