Synopsis is a bring-your-own-key (BYOK) browser extension with no backend server operated by the developer.

What is stored locally in browser (storage.local), never transmitted:
- The provider, model, endpoint URL and API key you configure.
- UI preferences (theme, text size, summary length, thinking-mode toggle).
- A cache of Ollama model names that do not support thinking-mode, used to skip a redundant network request on subsequent summaries.

What is transmitted, only when we click Summarize:
- The extracted text of the article or selection.
- It is sent directly from your browser to the API endpoint you configured (Google Gemini, OpenAI or any OpenAI-compatible endpoint, or your own Ollama server). The developer does not proxy, log, or store this content.

If we select the Ollama provider with a localhost endpoint, no data leaves the computer.

The extension performs no analytics, telemetry, or remote-script loading. The complete source code is included in this submission package; there is no build step.