Firefox 154 Is Here With Smarter AI Access, PDF Highlighting, and Tighter Privacy Controls

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Mozilla has shipped Firefox 154, and this release focuses on small-but-useful workflow upgrades rather than a flashy redesign. If you read or annotate PDFs in-browser, manage multiple AI settings, or just want your privacy controls to go a little further, this update is worth grabbing.

What's New in Firefox 154

• Manage AI quick action A new shortcut in the address bar jumps straight to the AI section of Settings, so you no longer have to dig through menus to manage AI-related features.
• PDF text highlighting You can now select and highlight text inside PDFs opened in Firefox, the same way you would on a regular web page.
• Smarter favicon handling Cached favicons now clear and refresh properly when you do a hard reload of a page.
• New cookie exceptions Sites can now be given exceptions so their cookies and site data survive shutdown, without exempting them from tracking protection or other cookie restrictions.
• Local Network Access protections extended to WebSockets Firefox's protections against malicious sites probing your local network now also cover WebSocket connections.
• Vertical Tabs polish In full-screen mode, the Vertical Tabs sidebar now hides along with the toolbars and reappears when you move your cursor to the screen edge.
• Under the hood Improvements to pointer lock (used by browser games) make the mouse cursor less likely to escape the Firefox window, plus new WebRTC APIs (RTCIceTransport.getSelectedCandidatePair(), RTCDtlsTransport error events) for developers.

Download

Grab the update via Firefox's built-in updater (Menu → Help → About Firefox) or download it fresh from Mozilla's official release notes page.

For version history and update tracking, see the Firefox page on UpdateStar.