Version 152.0a1, first offered to Nightly channel users on April 20, 2026
Firefox Nightly gets updated every day and as a consequence, the release notes for the Nightly 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 on our @FirefoxNightly Bluesky account, our @FirefoxNightly Mastodon account as well as read our Nightly Blog.
You can interact with other Firefox Nightly users and give your feedback to Mozilla staff in the Nightly Matrix room on chat.mozilla.org.
Starting with Firefox for Android 150, Nightly users can now choose a custom default location for their downloads.
Starting with Firefox 152, Nightly builds have an in-memory cache for the JavaScript compilation result, which is shared across navigation within the same domain, in order to improve the page load performance. The cache works in the same way as the existing in-memory cache for the stylesheets and the images. This can affect how the cached requests/responses are handled in DevTools, WebDriver, and WebExtensions APIs such as webRequest and declarativeNetRequest.
Starting with Firefox 151, Firefox for Android nightly builds include settings for enabling fine-grained control of AI features and also allows you to block future AI features.
Starting with Firefox 151, you can merge multiple PDFs within the Firefox PDF viewer in Nightly builds.
Improved support for more advanced cursor movement commands, including those relating to paragraph boundaries, on macOS.
Starting with Firefox 152, the address bar in Nightly builds autofills the pages you visit most - including specific pages within a site, not just site homepages - based on your browsing habits, and lets you dismiss suggestions you don’t want.
Video controls like play, pause, fullscreen, mute, and loop are now available in the right-click menu, even on sites like Instagram and TikTok where custom video players previously blocked access to them.
You can now shush your browser from the address bar by typing "mute" (or "shush" or "sssh") and using the address bar quick action. This will mute all tabs currently playing sound, in all Firefox windows.
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.
On Windows and Linux, you can now copy links via the tab context menu by right-clicking a tab and selecting Share > Copy Link, making it easy to copy a link without switching to the tab first. When multiple tabs are selected, you can copy all selected links at once. Windows users still retain access to Microsoft sharing options from the Share menu.
A "Send tab" toolbar button is now available which can be added via More Tools >Customize Toolbar.
When a website in a Private Browsing window may be broken because of tracker blocking, Firefox now shows an infobar after a reload. Clicking "Reload" in the infobar disables tracker blocking for that tab and site and reloads the page. All other tracking protections remain active.
In multiple monitor situations, the About Firefox window now more reliably opens on the display with the most recently-used Firefox window.
Fixed a number of text editing commands involving arrow keys in right-to-left languages on macOS.
GTK: Fixed the direction of word-based selection commands in RTL text fields.
Improved the reliability of saving images when dragging images to the desktop or Finder windows on macOS.
On macOS, dragging images from Firefox to the desktop or into desktop folders now correctly places items where they are dropped.
Site zooming via keyboard or mouse now supports more and smaller increments.
To ensure a seamless browsing experience, when a PDF or internally handled file finishes downloading, it now opens in a background tab if you have switched tabs or closed the original page.
In Firefox for Android, sharing a remote PDF will now share the file itself, rather than its URL, that you can still share by copying it from the awesomebar.
Starting with Firefox 151, the JavaScript Tracer can be enabled from DevTools Settings panel in Nightly builds. This enables tracing all JavaScript function calls. Unlike the performance profiler, this doesn't record a sample; instead, it traces all function calls.
The DevTools now have an option to toggle the display of comment nodes in the Inspector. This option is located in the Settings panel.
Starting with Firefox 150, multiple import maps per document are now supported in Nightly builds, giving web developers more flexibility when structuring and loading modern JavaScript modules. This is considered experimental as we gather feedback before enabling it in regular releases.
This feature is part of a progressive roll out.
Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.
Web Notifications can now have action buttons via actions option. Added actions can show up as buttons below notification text, or in "Options" list in case of macOS.
The field-sizing property is now available, allowing form controls to adjust in size to fit their contents.
Starting with Firefox 152, Nightly builds now support the WebAssembly JS-Promise-Integration proposal, improving the porting of applications to the Web.
Firefox now supports the WebAuthn Related Origin Request feature, which simplifies login flows by making Passkeys usable from multiple domains.
Firefox now supports a limited subset of the non-standard ::-webkit-scrollbar pseudo-element to improve web compatibility:
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.Starting with Firefox 152, Nightly builds allow the attr() function to be used in any CSS property. It now also allows to specify how the attribute value is parsed into a CSS value.
The Pointer Lock API now supports the unadjustedMovement option, allowing sites to receive raw mouse-movement data unaffected by OS-level acceleration.
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