Firefox Beta version 153.0beta, released on June 17, 2026, introduces significant new features and improvements. High Dynamic Range (HDR) video playback is now available on Windows, requiring HDR mode to be enabled in display settings. The 'Containers' feature allows for isolated online sessions within the same browser window. PDF management has been enhanced with the ability to merge multiple PDFs and add images as new pages using the integrated PDF editor.

Users can now quickly pick and copy colors from any webpage by typing "pick color" in the address bar. Sharing pages via QR codes is also a new option, accessible by right-clicking a tab. Firefox now verifies and displays Qualified Website Authentication Certificates (QWACs) per eIDAS regulations and offers improved support for videos with overlays. The location permission icon is now prominently highlighted in red when a website accesses location data.

Firefox Labs can be accessed more easily by typing "labs" in the address bar. Experimental support for the JPEG XL image format, offering better compression, is available via the Firefox Labs panel. Extensions no longer access local files by default, requiring explicit user permission. Local Network Access restrictions are enabled by default, requiring websites to request permission before connecting to local devices. Developers benefit from a new "Local Mode" for easier testing of APIs and updated HTML parsing rules for `<select>` elements. The Error.stack Trace Limit property is introduced for JavaScript error stack depth optimization, and the Picture In Picture API is now exposed for web developers.