Version 125.0a1, first offered to Nightly channel users on February 19, 2024
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.
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 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.
Starting with Firefox 124, a simpler and more unified dialog for clearing user data is now available. In addition to streamlining data categories, the new dialog also provides insights into the site data size corresponding to the selected time range.
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.