It says "html5: Video file not found" and I cannot play any video.
It says "html5: Video file not found" and I cannot play any video.
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Is this with all websites/pages, some, a few?
Make sure you are not blocking content.
Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}
A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?
https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop also see https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/
https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection
Many site issues can be caused by corrupt cookies or cache.
Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.
- How to clear the Firefox cache {web link}
You can check the Web Console for media related messages.
- "3-bar" menu button -> Web Developer or Tools -> Browser Tools -> Web Developer Tools
- https://developer.mozilla.org/en-US/docs/Tools/Web_Console