Mino Translator

TL;DR: Mino Translator does not collect your personal information, browsing history, or page content for analysis. The extension only sends selected text to the AI translation API you configured when it runs on YouTube subtitle pages or when you manually trigger text selection translation.

1. Information We Collect

1.1 Information You Provide

• API Key: The API key you enter in the options page for AI translation services. It is encrypted with AES-256-GCM before being stored in Chrome's sync storage (chrome.storage.sync). It is used only on your local device and is never uploaded to our servers.
• Translation Preferences: Your chosen model, target language, subtitle style (font size, color, position, opacity, etc.). These are stored locally and used solely to personalize your experience.

1.2 Temporarily Processed Data

• YouTube Subtitle Text: To provide subtitle translation, the extension reads the current video's subtitle text and sends it to your configured AI translation API. This text is used only for the translation request and is not persisted or logged.
• Selected Text for Translation: When you manually select text on a page and trigger translation, the extension sends that text to the AI translation API. This text is used only for the translation request and is not persisted.
• Page URL: The extension reads the current page URL (YouTube only) to identify the video ID and load corresponding subtitles. This information is not transmitted or recorded.

2. How We Use Data

All data processing serves a single purpose: translate text from the source language to your target language. The flow:

• The extension captures subtitle text or user-selected text
• It assembles a translation request and sends it to your configured third-party AI API
• The translation result is received and displayed on the page
• Once translation completes, all temporary data is released from memory

3. Data Sharing & Transfer

• We do not collect, sell, or share any of your data.
• Translation text is sent to the third-party AI service provider of your choice (OpenAI-compatible model services, including but not limited to Agnes AI, DeepSeek, OpenAI, Gemini, etc.), and is subject to that provider's own privacy policy. Please review their terms before use.
• The extension has no backend server. All configuration data is stored only in your browser's local and sync storage.

4. Data Storage & Security

• API Key Encryption: API keys are encrypted with AES-256-GCM before storage. The encryption seed is derived via PBKDF2, and the key exists only in your current browser environment.
• Translation Cache: The extension uses a two-tier cache: an in-memory cache (valid during the current page session, released on page close) and a local persistent cache (stored in chrome.storage.local, automatically purged after 10 days). Both tiers exist solely to avoid sending duplicate text to the translation API.
• No Backend Server: The extension does not operate any backend server, collect logs, or track user behavior.

5. Permission Justification

• storage: Stores your encrypted API keys and preferences.
• activeTab: Reads text you manually select on the current page for translation.
• tabs: Detects YouTube page state to load subtitles.
• host_permissions (youtube.com): Injects subtitle translation functionality on YouTube pages only.
• offscreen: Manages background audio and other auxiliary functions.
• alarms: Used for periodic cleanup of expired translation caches, ensuring storage space is properly released.
• host_permissions (<all_urls>): Enables text-selection translation on any webpage. The extension does not use this permission to record or track your browsing.

6. Your Rights

• Delete Data: Clear all stored settings and data from the extension options page (right-click extension icon → "Options" → clear button at the bottom). You can also uninstall the extension from Chrome's extension manager to delete all local data.
• Control API Keys: Modify or delete configured API keys at any time.
• Choose Your Model: Freely select or switch between AI translation providers.

7. Policy Updates

This privacy policy may be updated to reflect feature changes or legal requirements. Significant changes will be announced in the next extension update. Please check this page periodically.

8. Contact Us

If you have any questions about this privacy policy, please reach out via:

• GitHub Issues: github.com/LZKDreamer/MinoTranslator/issues