Firefox 154.0b10

New

• Exceptions for sites that have their cookies & site data cleared on shutdown can now be set without exempting the site from tracking protection and other cookie restrictions.
• Firefox's Local Network Access protections now extends to WebSocket connections. Websites that try to open a WebSocket to a device on your local network will now ask for your permission first.
• In Firefox for Android, improved the reliability of automatic translations for users with multiple languages selected in system settings.
• The address bar now includes a "Manage AI" quick action that opens the AI section of Settings.
• Firefox now gives Windows users the ability to change their default browser icon in Settings (except for MSIX installs). Support for MSIX installs, macOS and Linux is coming soon.
• Performing a hard reload on a page (holding Shift while clicking the Refresh button) now also clears and updates its cached favicons.
• You can now backup your profile locally on macOS devices and restore that profile between windows, macOS and linux. (Learn more)
• When downloading a file in Firefox for Android, you can now customize the file name and the download location. You can also define a custom download location for your downloads.
• In Smart Window, Firefox can now organize your open tabs into groups for you by suggesting groupings of related tabs and naming each one. This feature is part of a progressive roll out. What is a progressive roll out? Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.

Fixed

• When using Vertical Tabs in full screen mode, the sidebar is now hidden along with the toolbars, and reappears when moving the cursor to the edge of the screen.
• The display of PDF documents in the print-preview are now scaled correctly when using “Fit to Page Width” option.
• Fixed an issue on macOS where closing a browser window could leave behind an invisible window that continued to capture mouse clicks over the area where it used to be.
• If the Windows taskbar is set to auto-hide, Firefox will no longer require minimizing/maximizing after launch to allow the Windows taskbar to show.

Changed

• Text selected in PDFs is now highlighted clearly like in normal web pages. The selection color also follows OS settings like high-contrast mode.
• Video seeking is now significantly faster on macOS, making scrubbing and jumping to a point in a video much more responsive.
• In Firefox for Android, Bookmarks Search now shows up to 75 results per query, making it easier to find your bookmarks without refining your search.
• Firefox View is moving out of the toolbar by default for new profiles and profiles where it hasn’t been used recently. You can still open it from List all tabs > View all tabs, or add it back from the Customize toolbar menu.

Developer

• Developer Information
• The JSON Viewer now shows a breadcrumb path at the bottom for the selected entry.
• Firefox now supports Iterator.prototype.includes(), allowing developers to check whether an iterator contains a given value without first converting it to an array.
• Firefox now supports the Iterator.prototype.join method that allows joining an iterator into a string, similar to Array.prototype.join.
• Firefox now supports new Iterator.prototype.chunks and Iterator.prototype.windows methods that allow consuming an iterator as either overlapping or non-overlapping subsequences of configurable size.

Web Platform

• Added a time picker user interface to and , making selecting a time more accessible and intuitive.
• Firefox now supports the sibling-index() and sibling-count() CSS functions. These functions allow an element to be styled with calculations that use its index among its siblings and its total count of siblings (including itself), respectively.
• Added support for the No-Vary-Search HTTP response header for the HTTP disk cache. Servers can now declare which URL query parameters are irrelevant to the response, allowing Firefox to reuse cached resources across parameter variations and improving cache hit rates.
• Firefox now supports the text-box-trim and text-box-edge CSS properties, and the associated text-box shorthand. These properties allow you to control the leading space above and below text, enabling simpler and consistent vertical spacing and alignment.