Enable MP4 (H.264 + AAC) HTML5 video in Firefox on Windows XP without Flash - Page 27 - Browsers working on Older NT-Family OSes - MSFN
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Enable MP4 (H.264 + AAC) HTML5 video in Firefox on Windows XP without Flash - Page 20 - Browsers working on Older NT-Family OSes - MSFN
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Trying to Enable MP4 on FF 52.4.0, do I need to reinstall? | Firefox Support Forum | Mozilla Support
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