Firefox Nightly
Release Notes

Starting with Firefox 122, the URL Paste Suggestion feature is now enabled by default in Nightly builds. This enhancement provides a convenient way for users to quickly visit URLs copied to the clipboard in the address bar of desktop Firefox. When the clipboard contains a URL, and the user focuses on the URL bar, an autocomplete result appears automatically. Activating the clipboard suggestion will navigate the user to the URL with 1 click.

Starting with Firefox 122, scroll animations triggered using a mouse wheel or using the keyboard (e.g. arrow keys, Page Down/Up) are now based on a Mass-Spring-Damper physics model in Nightly builds, this gives animations a more realistic feel.

Starting with Firefox 122, it is now possible to highlight information in the Firefox PDF viewer in Nightly builds.

Firefox for Android now supports HTML drag and drop API when using a mouse. Also, it accepts plain text or HTML text by the drop operation from external applications.

Starting with Firefox 124, Firefox now prompts nightly users in the US and Canada to save their addresses upon submitting an address form, allowing Firefox to autofill stored address information in the future.

Starting with Firefox 124, Nightly users can now search in the Address Bar for tabs open in different containers. This behavior can be controlled through the browser.urlbar.switchTabs.searchAllContainers boolean preference.

Caret browsing mode now also works in the PDF viewer. (Learn more)

Starting with Firefox 124, a simpler and more unified dialog for clearing user data is now available in Nightly builds. In addition to streamlining data categories, the new dialog also provides insights into the site data size corresponding to the selected time range.

Firefox on Mac now uses the macOS fullscreen API for all types of fullscreen windows. This should better match the expected macOS user experience for fullscreen spaces, menubar and the Dock. Users who would like to return to the previous behavior should set the deprecated full-screen-api.macos-native-full-screen pref to false.

Starting with Firefox 122, the popover attribute is now supported by default in Nightly builds. The popover global attribute is used to designate an element as a popover element. The element won't render until it becomes shown, it will then render on top of other page content.

Starting with Firefox 122, the remaining part of the async clipboard API has been enabled by default in Nightly builds. A paste context menu will appear for the user to confirm when attempting to read clipboard data not provided by the same-origin page.

Starting with Firefox 122, Nightly builds include support for Unicode text segmentation to JavaScript.

Firefox added support for the Screen Wake Lock API.

You can now use HTTP(S) and relative URLs when creating WebSockets.

Added support for AbortSignal.any.