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How do I enable HTML5? I disabled it or blocked it by accident.

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Ghiji
Ghiji
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All the videos are blocked. For example, Youtube and Facebook videos. It only shows a black screen. Plus, only Flash works for now.

All the videos are blocked. For example, Youtube and Facebook videos. It only shows a black screen. Plus, only Flash works for now.

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Bolaram Paul
Bolaram Paul
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install Flash plugin... such as adobe flash plugin

cor-el
cor-el
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You can check if there are media.*.enabled prefs that show user set (bold) on the about:config page.

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

Use the Search bar at the top of the about:config page to locate preferences more easily: media.*.enabled

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

  • Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window