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Banged my head many times trying to figure out why opening .PDF on my harddrive with firefox would open another download dialog, and not the PDF.js viewer. Then I noticed this. [win7][firefox30/31].
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Trying to upload an mp4 video to reddit - Do I need a plugin or something? : r/firefox
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How to Play Mp4 on Firefox in Ubuntu 22.04
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gstreamer - How do I get HTML5 h.264 Video working on Firefox? - Ask Ubuntu
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Easy Youtube Video Downloader Express – Get this Extension for 🦊 Firefox (en-US)