Severity: normal → blocker
OS: Unspecified → Mac OS X
Hardware: Unspecified → x86_64
Is the issue reproducible with safe mode , and clean profile ? Also, can you provide the actual URL the issue happens?  https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode  https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
The issue is reproducible with safe mode. I haven't test the clean profile. You can try this address: https://www.youtube.com/watch?v=jqdOkXQngw8 => no video appears
The video appears for me. If the issue also happens with safe mode, it could be caused by your configuration. Can you provide the troubleshooting information, by following? 1. open about:support 2. click "Copy raw data to clipboard" 3. save the copied text as a file 4. attach the file to this page
Severity: blocker → normal
It works. Many thanks.
Status: UNCONFIRMED → RESOLVED
Last Resolved: 2 years ago
Resolution: --- → INVALID
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