Firefox Nightly
Release Notes

Starting with Firefox 115, Nightly users without platform support for H264 video decoding can now fallback to Cisco's OpenH264 plugin for playback.

Starting with Firefox 115, Nightly users can access automated translation of web content in Firefox. Unlike cloud-based alternatives, translation is done locally in Firefox, so that the text being translated does not leave your machine.

Sidebar switcher allows users to access Bookmarks, History and Synced Tabs panels easily, quickly switch between them, move the sidebar to another side of the browser window, or close the sidebar. Now, keyboard users would be able to do it all with ease too, with or without any assistive technology running, without needing to memorize keyboard shortcuts to access these panels.

When an update is available in English locales, users will now have access to the release notes in the update notification prompt in the form of a "Learn More" link.

It is now possible to copy any file from your operating system and paste it into Firefox.

You asked, and we listened! The volume slider is now available in Picture-in-Picture.

We added the possibility to edit existing text annotations in the PDF reader.

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.

Added support for the dirname attribute to pass text directionality information about input and textarea elements to the server. (learn more)

Firefox now supports CSP3 external hashes.

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.

This release now supports proper BYOB readers on Fetch and WebTransport, which allows developers to prepare their ArrayBuffer so that it can be reused for read requests and thus saves memory allocation. .getReader({ mode: "byob" }) on Fetch and WebTransport streams was supported on previous releases but without true BYOB support, as new memory allocation still occurred internally.