Try turning WebM off in about:config. Otherwise it's a known bug. Apparently not... | Hacker News

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tyteen4a03 on Nov 21, 2017 | parent | context | favorite | on: Firefox Private Browsing vs. Chrome Incognito: Whi...

Try turning WebM off in about:config.

Otherwise it's a known bug. Apparently not enough people complained about it so it is perceived to not be a blocking bug for 57.

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