Firefox Nightly
Release Notes

Starting with Firefox 115, Nightly supports a new “Copy Link Without Site Tracking” context menu action which prevents disclosure of identifying or sensitive information by removing superfluous query and tracking parameters from the copied links.

Starting with Firefox 117, recently closed tabs now persist between sessions for Nightly users that don't have automatic session restore enabled. Manually restoring a previous session will continue to reopen any previously open tabs or windows.

Starting with Firefox 117, Nightly builds now support adding images when editing PDFs in addition to adding text and drawing.

Starting with Firefox 118, Nightly now supports UI setting that enables the user to opt-in into GPC, a privacy signal that tells the websites that the user doesn’t want to be tracked and doesn’t want their data to be sold.

Firefox View now includes more content:

• You can now see all open tabs from all windows.
• If you sync open tabs then you will now see all tabs from other devices.
• Browsing history is now listed and you can sort by date or by site.
• As before, recently closed tabs are also listed in Firefox View.

If the relevant Windows mouse properties system setting is enabled, the mouse pointer will disappear while typing.

If you're migrating your data from Chrome, Firefox now offers the ability to import some of your extensions as well.

Media sniffing is now disabled for top-level documents served as type application/octet-stream. Allowing these files to be downloaded instead of attempting playback.

Starting with Firefox 116, we are enabling for nightly users a prototype Federated Credential Management implementation, a Web Platform API that allows users to login to websites with their federated accounts in a privacy preserving manner.

Starting with Firefox 117, partial support for the custom highlight API is now available in Nightly builds, allowing web developers to give ranges an appearance.

ARIA reflection for simple attributes and default Accessibility Semantics for Custom Elements are now supported. Note that this includes boolean, enum, number, and string attributes, but not attributes that reference other elements.

Starting with Firefox 119, the :has() selector is now available in nightly builds. This allows authors to match elements that has, or "anchors", at least one element matching its relative selector.

credentialless is now supported in Cross-Origin-Embedder-Policy.