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''Hide support for WebM formats - these are the typical "fallback" formats on YouTube'' (4) If the '''''' preference is currently set to true, double-click it to to switch the value from true to false (3) If the '''''' preference is currently set to true, double-click it to to switch the value from true to false (2) In the search box above the list, type or paste '''mp4''' and pause while the list is filtered ''Hide support for MP4 formats - Firefox probably can't play these on Windows XP anyway''

Click the button promising to be careful. (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. (You can ignore the encoder and audio-related WebM preferences.) (7) If the preference is currently set to true, double-click it to to switch the value from true to false (6) If the preference is currently set to true (it is false by default), double-click it to to switch the value from true to false (5) In the search box above the list, type or paste webm and pause while the list is filtered Hide support for WebM formats - these are the typical "fallback" formats on YouTube (4) If the preference is currently set to true, double-click it to to switch the value from true to false (3) If the preference is currently set to true, double-click it to to switch the value from true to false (2) In the search box above the list, type or paste mp4 and pause while the list is filtered Hide support for MP4 formats - Firefox probably can't play these on Windows XP anyway (1) In a new tab, type or paste about:config in the address bar and press Enter/Return. If you want to set Firefox to indicate that you can't play those formats - this is not YouTube specific, it will affect all sites - you can try this: Second, YouTube will check the formats your browser's HTML5 player can handle and will use Flash if neither MP4 nor WebM is supported. First, as noted in the above reply, when the forum polled your plugins, "Shockwave Flash" was not detected, so that's the first problem.