Magic Voice Scriber is designed according to the principle of absolute Privacy by Design:

1. Zero Data Collection:
The extension runs 100% locally within your Thunderbird client. We operate no external backend servers and never collect, intercept, or track your voice recordings, emails, or API keys. Zero analytics, zero ad trackers, and zero telemetry scripts.

2. Audio and Text Processing:
Audio captured via your microphone is retained strictly in volatile memory (RAM) during recording and immediately released once transcription completes or is cancelled. Depending on your configuration:
- Google Gemini API: audio is transmitted directly to generativelanguage.googleapis.com using your personal API key via secure HTTP headers.
- OpenAI / Third-party Cloud: audio is sent directly to your configured provider with strict cross-domain key isolation.
- Local Models (Ollama, LM Studio, local Whisper): processed 100% offline on your own machine.

3. Local Storage:
Your configuration preferences and API keys are stored exclusively on your device inside browser.storage.local.

4. Permission Justifications:
- compose & scripting: inserts transcribed text at caret position in the composer window.
- storage: saves local user preferences.
- menus: provides quick access to settings.
- Host permissions: connects directly and exclusively to user-configured APIs.