Firefox 157 Is Here. Check What Smart Window Remembers.

Mozilla began rolling out its new Firefox design with version 157 on September 29. Compact Mode returns, the theme picker changes, and New Tab gains a dedicated space for pinned shortcuts. Those visible changes are a useful reminder to review the browser's less visible choices, especially if you use Smart Window. Its memory feature predates this design release. Local storage does not mean local processing Mozilla's memory documentation says selected browsing or chat history is sent to its server to generate memories, which are then stored locally. Mozilla says it does not retain the submitted data after processing. This is its description, not our independent verification. Review learning and saved memories separately Go to Settings → AI controls → Smart Window → Smart Window settings. Turn off learning from browsing and chats to stop new memories, then use Manage memories to delete saved ones. Clearing history does not delete them. Controls and availability can vary by rollout and region. What the Mistral announcement changes In its September 16 partnership announcement, Mozilla said Mistral Small 4 was coming to Smart Window Beta for users in the US and Canada, alongside expansion to France with French-language support. It said other model choices would remain available. Choosing a model does not, by itself, answer where your data is processed; review the feature's data-handling description separately. Watch Mozilla's release overview This is Mozilla's own promotional overview of the design release. It is context for the visual changes, rather than evidence of backend privacy guarantees. The player loads only when you choose to play it. If you are returning after reading our earlier Project Nova report, the key change is timing: the design has moved from an announced project to a public rollout. For a broader settings review, start with the privacy guide.