Butter Home does not collect, store or send any personal data. It has no account, no analytics, no telemetry and no crash reporting.

The new tab page makes no network requests of any kind. Shortcuts are shown as letter tiles, so no icons are downloaded and no site ever learns which shortcuts you keep.

Your settings (colours, clock, shortcuts, the name in the greeting) are stored in Firefox's local extension storage on your computer. When Butter is installed, they are shared with Butter through Firefox's add-on messaging, on your computer only.