Firefox 154 Arrives With AI Shortcut, Stronger Local Network Guards and Fresh Web Tools

Mozilla pushed Firefox 154 to stable channels on August 17, 2026. The update arrives just before its official rollout on August 18. It brings targeted improvements that address privacy, daily usability and developer needs. And it does so without fanfare.

The most noticeable addition sits in the address bar. Type “Manage AI” and Firefox opens the dedicated AI section in Settings. Phoronix highlighted this quick action as one of the release’s standout conveniences. Users who experiment with Firefox’s built-in AI features gain one-click access. No more digging through menus.

Privacy gains real attention here. Firefox now extends its Local Network Access protections to WebSocket connections. Sites attempting to open a WebSocket to a local device must first request permission. This closes a gap that previously allowed silent access. The change appears in both the official beta notes and subsequent coverage.

Related adjustments tighten cookie handling. Users can set exceptions for sites whose cookies and site data get cleared on shutdown. Those exceptions no longer force the site out of tracking protection or other cookie restrictions. The result feels more precise. Privacy controls stay intact while exceptions remain usable. Mozilla’s beta release notes document the behavior exactly.

PDF handling sees multiple fixes. Selected text in PDFs now highlights clearly. The color respects operating-system settings, including high-contrast modes. Print preview scales documents correctly under the “Fit to Page Width” option. These tweaks remove small but persistent annoyances for anyone who works with documents inside the browser.

Video playback on macOS benefits from faster seeking. Scrubbing through timelines or jumping to specific points responds more quickly. The improvement stands out on laptops where responsiveness matters. Meanwhile, hard reloads now clear and update cached favicons. Pages that change their icons no longer show stale versions after a Shift-refresh.

Cross-platform profile management gets a boost. Users who create a local backup on macOS can restore that profile on Windows, macOS or Linux systems. The feature simplifies migration and backup workflows. It reflects Mozilla’s ongoing effort to make Firefox feel consistent across operating systems.

Windows users receive the ability to change the default browser icon directly in Settings. Support for MSIX installs and other platforms will follow. And when the Windows taskbar is set to auto-hide, Firefox no longer requires a minimize or maximize cycle after launch to restore proper behavior. Small quality-of-life changes. They add up.

On Android the list grows longer. Automatic translations work more reliably for users with multiple system languages. Bookmarks search now returns up to 75 results per query. Downloads let users customize file names and choose specific locations, including a persistent custom directory. These updates target frequent mobile tasks that previously required extra steps.

Tab management continues to evolve. The Smart Window feature suggests groupings of related tabs and names them automatically. Vertical Tabs in full-screen mode hide the sidebar alongside toolbars. Move the cursor to the edge and it reappears. Firefox View has moved out of the toolbar by default for new profiles and those where the feature sees little use. Users can still add it back through customization. The JSON Viewer adds a breadcrumb path at the bottom of selected entries. Navigation inside complex data structures becomes simpler.

Developers receive several new capabilities. Firefox now supports the CSS functions sibling-index() and sibling-count(). The Iterator prototype gains includes(), join(), chunks() and windows() methods. These additions let developers work with iterators more directly without converting them to arrays first. The text-box-trim and text-box-edge properties, along with their text-box shorthand, offer finer control over text layout. A time-picker interface for input elements of type time and datetime-local improves accessibility and ease of use.

Web platform updates include support for the No-Vary-Search HTTP response header in the disk cache. On the media side, RTCIceTransport.getSelectedCandidatePair() and the selectedcandidatepairchange event arrive for WebRTC work. The error event now fires on RTCDtlsTransport for DTLS and fingerprinting issues. WebDriver BiDi sees multiple enhancements, including download ID tracking in events, screencast commands, locale overrides for workers and better user-context handling. Add-on authors gain the sandbox manifest key. It allows pages with opaque origins that lack direct extension API access and permits eval() where content security policy previously blocked it.

Experimental features disabled by default include full support for the line-clamp CSS property without the -webkit- prefix, percentage values for text-decoration-inset and the CSS Typed Object Model. These sit behind preferences for testing. Mozilla’s MDN release notes catalog them in detail.

The release also fixes an invisible window artifact on macOS after closing a browser window. Mouse clicks no longer get captured in phantom areas. And Firefox View’s relocation reflects a broader pattern. Mozilla steadily refines default layouts based on usage data.

Industry observers note the timing. Mozilla recently announced a shift to two-week release cycles starting with Firefox 155. The faster cadence aims to deliver fixes and features to users sooner. Firefox 154 therefore serves as one of the last monthly updates under the older schedule. 9to5Linux covered both the new features and the upcoming schedule change in its reporting published hours after the builds appeared.

Performance receives indirect lifts through these changes. Faster video seeking, quicker tab organization and improved cache handling reduce friction. Yet the update focuses more on polish and protection than raw speed. Users running uBlock Origin or similar tools continue to benefit from Firefox’s stance on extension capabilities. That compatibility remains a quiet advantage as other browsers tighten restrictions.

Profile backups, AI shortcuts and WebSocket permissions may seem unrelated at first. Together they show Mozilla balancing three fronts. Protect users from local network surprises. Make everyday tasks quicker. Give developers modern primitives without breaking existing code. The balance feels deliberate.

Downloads are available now from Mozilla’s servers. The official launch follows on August 18 with corresponding ESR updates. Early adopters already report smooth transitions. The changes land without requiring restarts in many cases. And the address-bar quick action already draws praise for its simplicity.

Firefox 154 won’t dominate headlines. Its value lies in accumulated refinements. Stronger network boundaries. Smoother document handling. New iterator methods that shorten code. A browser that listens to both power users and casual tabs-and-bookmarks crowd. The combination keeps it relevant in a market crowded with alternatives.