Bitmovin and Mozilla, both members of the Alliance for Open Media (AOM), are partnering to bring AV1 playback with HTML5 to Firefox as the first browser to play AV1 MPEG-DASH/HLS streams. While the AV1 bitstream is still being finalized, the industry is gearing for fast adoption of the new codec, which promises to be 25-35% more efficient than VP9 and H.265/HEVC.