Firefox (64-bit)

What's new in this version:

New:
- It's now possible to import bookmarks, history and passwords not only from Edge, Chrome or Safari but also from Opera, Opera GX, and Vivaldi for all the folks who want to move over to Firefox instead
- GPU sandboxing has been enabled on Windows
- Note: A bug in the popular X-Mouse Button Control (XMBC) tool may cause mouse wheel scrolling to stop working. The author(s) are working on an update. Meanwhile, scrolling can be restored by reconfiguring XMBC: either disable the Make scroll wheel scroll window under cursor option in the global settings, or enable the Disable scroll window under cursor option if using a custom profile for Firefox.
- On Windows, third-party modules can now be blocked from injecting themselves into Firefox, which can be helpful if they are causing crashes or other undesirable behavior
- Date, time, and datetime-local input fields can now be cleared with Cmd+Backspace and Cmd+Delete shortcut on macOS and Ctrl+Backspace and Ctrl+Delete on Windows and Linux
- GPU-accelerated Canvas2D is enabled by default on macOS and Linux
- WebGL performance improvement on Windows, MacOS and Linux
- Enables overlay of hardware-decoded video with non-Intel GPUs on Windows 10/11, improving video playback performance and video scaling quality

Fixed:
- Various security fixes

Changed:
- Colorways are no longer available in Firefox, at least not in the same way. You can still access your saved and active Colorways by selecting Add-ons and themes from the Firefox menu. Additionally, you can now install Colorways from all of the previous collections by visiting Colorways by Firefox on the Mozilla Add-ons website.

Developer:
CSS:
- Container queries and container query length units are now supported by default. For more information on these queries and the related units of length, see the CSS Container Queries documentation
- The color-gamut media query is now supported
- The list attribute is supported in <input> elements with type="color" on Windows and Linux

JavaScript:
- Serialization of native Error types now includes the stack property in workers when using Worker.postMessage() and structuredClone(). With this addition, cloning native error stacks now works for all methods that use the structured clone algorithm, in both the main thread and workers. (See bug 1774866 for more details.)

APIs:
- The midi permission of the Permission API is now supported. This allows the permission status for using the Web MIDI API to be queried using navigator.permissions.query()
- ReadableStream now supports asynchronous iteration over the chunks in a stream using the for await...of syntax
- WebRTC now supports sending the set of available encodings when adding a tranceiver to a peer connection, and also getting the active encoding associated with a sender. Specifically, RTCPeerConnection.addTransceiver() now supports using the sendEncodings option in the init parameter object, and RTCRtpEncodingParameters.active can be used to determine whether or not the encoding is being used to send data. (See bug 1676855 for more details.)
- WebRTC methods RTCRtpSender.getParameters(), RTCRtpSender.setParameters(), and RTCRtpReceiver.getParameters() are now compliant with the specification

WebDriver conformance (WebDriver BiDi, Marionette):
WebDriver BiDi:
- Added support for the network.beforeRequestSent
- Added support for the browsingContext.captureScreenshot command to capture full page screenshots
- Added support for serialization and deserialization of generic platform objects
- Added a timestamp field to the browsingContext.domContentLoaded and browsingContext.load events
- Added a type field to the response for script.evaluate and script.callFunction to indicate either success or exception results

Marionette:
- The cache for known nodes (element and shadow root references) has been moved from the parent to the web content process following recent WebDriver classic changes
- Improved the JSON serialization and deserialization algorithms to be compliant with the WebDriver classic specification

Changes for add-on developers:
- The defaultZoomFactor property of tabs.ZoomSettings now returns the value of the default zoom factor setting

Enterprise:
- Various bug fixes and new policies have been implemented in the latest version of Firefox

Web Platform:
- Firefox now supports CSS named pages, allowing web pages to perform per-page layout and add page-breaks in a declarative manner when printing
- Firefox now supports CSS size container queries, see the MDN page for documentation on this feature