Firefox 159 brings page change tracking, improved macOS sharing, and Google Lens on iOS

Mozilla has shipped Firefox 159, headlining the release with expanded abilities for its AI-powered Smart Window. Users can now ask the browser to monitor pages for changes such as price drops or restocks by typing /watch into the chat, choosing how often it checks; when a match turns up, Firefox fires a desktop notification and flags it with a dot on the Tasks button in the toolbar. Watches can be edited, paused, checked manually, or deleted from that Tasks button or the about:smartwindowtasks page. Mozilla notes the feature is part of a progressive rollout, so not everyone will see it immediately. Separately, the AI chatbot's summarize page option now sends the page's address to the chatbot provider rather than the page's text, which means lengthy articles are no longer truncated into partial summaries.

Desktop users get a cluster of smaller but practical changes. Sharing on macOS now routes through the native macOS share picker, showing a page preview and recent contacts alongside AirDrop, Messages, and other apps, and multiple selected tabs can be shared at once. Saved passwords appear in the sidebar by default, no longer requiring users to add the Passwords tool first. On macOS, apps that sign in through the default browser, ChatGPT among them, now open their sign-in page in Firefox rather than Safari when Firefox is set as default. Keyboard navigation has also been reworked: open tabs can be searched with Ctrl+Shift+A on Windows and Linux or Cmd+Shift+A on macOS, while the extensions and themes shortcut moves to Ctrl+Shift+F on Windows and Linux and Cmd+Shift+E on macOS. All of these bindings can be reassigned in about:keyboard.

On iOS, Mozilla is giving Quick Answers a redesign, promising a cleaner, more intuitive experience, though the feature remains limited to users in the United States. The iPhone update also brings Google Lens into Firefox, letting users search what they see on screen.