Mozilla has officially released Firefox 153, bringing another round of improvements to its open-source web browser. Firefox 153 became available on the stable release channel on July 21, 2026. While this isn't a major redesign, Firefox 153 delivers a collection of practical updates that benefit both everyday users and web developers. HDR Video Playback Comes to WindowsOne of the headline features in Firefox 153 is support for High Dynamic Range (HDR) video playback on compatible Windows systems. For Linux users, developers, and everyday web users alike, Firefox 153 is another worthwhile update that reinforces the browser's position as one of the leading open-source alternatives in today's web ecosystem.