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Release Notes

Release Notes tell you what's new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.

153.0beta Firefox Beta

June 17, 2026

Version 153.0beta, first offered to Beta channel users on June 17, 2026

Firefox Beta gets updated 3 times a week and as a consequence, the release notes for the Beta channel are updated continuously to reflect features that have reached sufficient maturity to benefit from community feedback and bug reports.

Warning: Features listed here may or may not make a final release of Firefox.

In addition to these release notes, you can follow ongoing development via the Firefox Trains website or our @FirefoxBeta Bluesky account.

New

  • High dynamic range video is now supported in Firefox on Windows 10 and 11 for HDR displays connected to AMD and NVIDIA GPUs (notably this excludes Intel+NVIDIA laptops for now), work is underway to enable this feature on more GPU vendors. To use this feature you must ensure that HDR mode is enabled for the relevant displays in Windows Settings - Display. HDR videos may appear brighter in Firefox than in other browsers, which will be improved in a future release, as well as optimizations for performance.

  • Added support for Apple's system-wide full-screen keyboard command (Globe-F)

  • Share any open page with a QR code. Right-click a tab, select Share > Generate QR Code. Great for posters, invitations, banners, and other printed materials. On macOS, you can also right-click the address bar to access the Share menu.

    Screenshot of a QR code generated for a page

  • Firefox Labs can now be opened quickly by typing "labs" or "experiment" in the address bar and selecting the Open Firefox Labs quick action.

    Screenshot of the Firefox Labs quick action being triggered from the address bar

  • Firefox now verifies and displays Qualified Website Authentication Certificates (QWACs) in accordance with eIDAS regulations.

  • Quickly pick and copy a color from any page by typing "pick color", "color picker", or "eyedropper" in the address bar and selecting the "Pick a color" quick action.

    Screenshot of the Pick Color quick action being triggered from the address bar

  • It is now possible to add images as new pages within PDFs using the Firefox PDF editor.

  • Added improved support for videos with overlays so users can more easily access video actions from context menus.

  • It is now possible to merge multiple PDFs by dragging a PDF in the PDF sidebar.

  • Firefox now highlights the location permission icon in red whenever a website has access to your location. The permission icon is also now visible on search results pages where it was previously hidden.

    Screenshot of the red geolocation warning in the address bar when the Geolocation API is being used

Firefox Labs

  • Firefox now offers experimental support for the new JPEG XL image format, which generally provides better compression than WebP, JPEG, PNG, and GIF and is designed to supersede them. You can enable it from the Firefox Labs panel in Settings.

Changed

  • Text selected in PDFs is now highlighted clearly like in normal web pages. The selection color also follows OS settings like high-contrast mode.

  • Extensions can no longer access local files by default. Users can grant or revoke this access via the new "Access local files on your computer" permission, separate from "Access your data for all websites".

Developer

Web Platform

  • Firefox now supports a limited subset of the non-standard ::-webkit-scrollbar pseudo-element to improve web compatibility:

    • Rules with non-zero width/height disable overlay scrollbars for the affected container.
    • display: none on ::-webkit-scrollbar behaves like scrollbar-width: none, hiding the scrollbar.
    • @supports selector(::-webkit-scrollbar) now evaluates to true.
    • Full styling capabilities (colors, border-radius, etc.) are intentionally not supported

  • Updated HTML parsing rules for <select> elements, aligning with web standards to support future customizable select dropdown features.

  • The vertical-align property was converted into a shorthand for baseline-source, alignment-baseline, and baseline-shift in Firefox 149. Now, alignment-baseline supports the new keywords alphabetic, ideographic, central, mathematical, and hanging, extending the variety of baselines to choose for alignment.

  • Implemented the new popover=hint spec, which removes a series of inconsistent and unexpected behaviors.

  • The circle() and ellipse() functions accept two new keywords closest-corner and farthest-corner for their radial size.

  • The newly added Error.stackTraceLimit property allows to set the maximal depth of the captured JavaScript error stack as a performance optimization.

  • Developers can now use the text import attribute to import text files using the module system.

  • The Picture In Picture API exposes a way for web developers to make use of user agent Picture-In-Picture functionality.

  • The Intl.LocaleInfo proposal adds the ability to query Locale information, such as week data (first day in a week, weekend start day, weekend end day), text direction and hour cycle used in the Locale.

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