Firefox has long been criticized for its sluggish response to certain feature requests. For instance, users first asked for MKV video format support more than eight years ago, yet only now is Firefox preparing to deliver it.
MKV is among the most widely used video formats, already supported extensively in other browsers such as Chrome and Chromium, where users can seamlessly stream MKV-based videos online without needing to download them or rely on dedicated players.
In the latest builds of Firefox Nightly, support for the MKV container has been introduced. Initially, due to codec constraints, playback is limited to AVC/H.264 and AAC within MKV files, with support for additional codecs expected to roll out gradually over time.
Users of Firefox Nightly can already enable the feature by toggling the media.mkv.enabled setting and restarting the browser. The development team has also encouraged users to report playback issues with MKV files containing AVC or AAC, so that problems can be analyzed and resolved.
The Matroska team, which oversees the MKV container format, has welcomed Firefox’s adoption and outlined its implementation plans. Their ultimate goal is for MKV support in Firefox to reach the same level of maturity and reliability already present in Chrome and Chromium.
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