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Re:Firefox Private Browsing vs. Chrome Incognito: Which Is F... by pixard on Monday November 20, 2017 @11:33AM (#15741113)
Try force enabling media.hardware-video-decoding.force-enabled -- decreased my CPU usage considerably.
Re:Firefox Private Browsing vs. Chrome Incognito: Which Is F... by jyavenard on Monday November 20, 2017 @02:44PM (#15742600)
it won't help on mac...

Firefox doesn't use a blacklist of drivers / GPU like it does on window to enable HW decoding or not. Typically mac hardware is far more reliable.

the media.hardware-video-decoding.force-enabled is only of use on Windows in the event a card is blacklisted and you want to override the blacklist