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Just to clear it up for everyone, since this account has been dishonest about how the AI will be implemented. It is *not* opt-in as this account has been claiming in the past, it's opt-out. The AI features begin enabled by default and you have to manually toggle them off, so make sure you do that.

Taking, for example, the tab grouping and naming feature, if you don't "Block AI enhancements", then you're offered the feature, and if you click the button, the use of AI is explained, and you have to confirm. If you confirm, then the local privacy-preserving model is downloaded and used.

Local models for UI features like tab grouping is a solid pattern. One thing worth watching is whether the model download itself leaks intent metadata to a CDN, even if inference stays on-device. How are they handling the model fetch - is it bundled with the browser or pulled separately?