YouTube videos play with disabled FP

Something strange has happened today. I disabled of FP (never activate), but also on some videos on YouTube, it will play in fact they didn't invite me activate FP. The other videos, correctly, say public Service must be enabled. Could someone explain this to me. Thank you

Hello, firefox is able to play videos html5 natively without the need for plugins: youtube.com/html5

Tags: Firefox

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