Firefox extension setup
Install CalmSignal from the Firefox Add-ons Marketplace—all processing on-device.
Overview
Go to addons.mozilla.org/en-US/firefox/addon/calmsignal/ and click "Add to Firefox." Once installed, sign in and choose whether CalmSignal should run on private windows.
Firefox prompts for text and notification permissions. Approve them so CalmSignal can analyze drafts and show nudges. All text analysis happens 100% on your device using on-device ONNX models or heuristics—your text never leaves your browser.
Privacy-first processing
The Firefox extension uses the same privacy-first architecture as Chrome: ONNX models run locally in your browser, with heuristics as a fallback. All processing is 100% on-device—no text is sent to servers unless you explicitly enable optional backend features (disabled by default).