Firefox downgrades VP9 videos to VP8 when measured performance is not enough
On systems where H.264 is not available or no HWA, VP9 is preferred. But in Tor Browser 7.0 all youtube videos degraded to VP8.
On systems where H.264 is not available or no HWA, VP9 is preferred. But in Tor Browser 7.0 all youtube videos degraded to VP8.