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Enable MP4 (H.264 + AAC) HTML5 video in Firefox on Windows XP without Flash - Page 26 - Browsers working on Older NT-Family OSes - MSFN
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Firefox 49 error "This browser does not support video playback" playing mp4 videos in Twitter in Win 8.1 with Flash Player 23.0.0.162 | Firefox Support Forum | Mozilla Support
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Cannot play MP4 file in Allure site: Your browser does not support video tag · Issue #1676 · allure-framework/allure2 · GitHub
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