Privacy Policy

Last Updated: December 28, 2025

1. Introduction

This Privacy Policy describes how the "Most Active Stocks Today - Real-Time Stock Tracker" Chrome extension ("we", "our", or "the Extension") handles information. We are committed to protecting your privacy and complying with applicable data protection laws.

2. Information We DO NOT Collect

The Extension does not collect, store, transmit, or share any of the following:

• Personal identification information (name, email, address, etc.)
• Browsing history or web activity
• Financial information or trading data
• Login credentials or passwords
• Payment information
• Location data
• Cookies or tracking identifiers

3. Data Storage

The Extension uses Chrome's local storage API solely to:

• Cache stock market data: Temporarily store publicly available stock information (prices, volume, changes) fetched from Yahoo Finance to improve performance and reduce API calls
• Store installation date: Keep a timestamp of when the extension was installed for internal functionality purposes

All data is stored locally on your device only. No data is transmitted to our servers or any third-party servers.

4. Third-Party Services

4.1 Yahoo Finance API

The Extension fetches publicly available stock market data from Yahoo Finance (query1.finance.yahoo.com). This data includes:

• Stock symbols and names
• Current prices
• Trading volume
• Price changes and percentages

This data is publicly available market information and does not contain any personal data. Yahoo Finance may have its own privacy policies governing their API usage. Please review Yahoo's Privacy Policy for more information.

4.2 External Website Links

The Extension provides links to www.youcku.top for detailed stock analysis. When you click these links:

• You will be directed to an external website
• The external website may have its own privacy policies and data collection practices
• We recommend reviewing the privacy policy of any external website you visit

5. Google Chrome Web Store and User Data Policy

This Extension complies with the Chrome Web Store Developer Program Policies and the User Data Privacy Policy.

5.1 Limited Use Requirements

In accordance with Google's Limited Use requirements, this Extension:

• Only requests permissions necessary for its core functionality
• Does not use or transfer user data for purposes unrelated to the Extension's core functionality
• Does not use or transfer user data to determine creditworthiness or for lending purposes

5.2 Secure Data Handling

The Extension follows Google's secure data handling practices:

• All data is handled locally on your device
• No data is transmitted over networks unnecessarily
• Chrome's built-in security features protect local storage

6. Permissions Explained

The Extension requests the following permissions:

6.1 Storage Permission

Purpose: To cache stock market data locally for faster loading and reduced API calls.

Data Stored: Publicly available stock information (symbol, price, volume, change percentage) and installation timestamp.

Retention: Data is automatically refreshed every 15 minutes and older cache is cleared.

6.2 Host Permissions

query1.finance.yahoo.com: Required to fetch real-time stock market data from Yahoo Finance API.

www.youcku.top: Used only when you click on stock cards to open detailed analysis on the external website. No automatic data transmission occurs.

7. Children's Privacy

The Extension does not knowingly collect any information from children under the age of 13. The Extension is not directed to children and does not collect any personal information from any users.

8. Data Security

While we do not collect personal data, we implement the following security measures:

• All Extension code is static and packaged within the Extension
• No remote code execution
• Local storage is protected by Chrome's built-in security
• HTTPS connections for API requests to Yahoo Finance

9. Your Rights

Since we do not collect personal data, there is no personal data to access, modify, or delete. You may:

• Clear cached data: Remove the Extension and all locally stored data will be automatically deleted
• Review stored data: Use Chrome DevTools to inspect local storage
• Uninstall: Remove the Extension at any time from chrome://extensions/

10. Changes to This Privacy Policy

We may update this Privacy Policy from time to time. If we make material changes, we will:

• Update the "Last Updated" date at the top of this policy
• Notify users through the Extension or Chrome Web Store listing
• Require consent for changes that affect data handling practices

We encourage you to review this Privacy Policy periodically.

11. Compliance

This Extension complies with:

• Google Chrome Web Store Developer Program Policies
• Chrome Extension Manifest V3 requirements
• General Data Protection Regulation (GDPR) principles
• California Consumer Privacy Act (CCPA) where applicable

12. No Monetization or Advertising

The Extension:

• Does not display advertisements
• Does not sell user data (we don't collect any)
• Does not include affiliate links or tracking
• Is provided free of charge

13. International Users

The Extension can be used worldwide. Since no personal data is collected or transmitted, there are no cross-border data transfer concerns.

15. Consent

By installing and using the Most Active Stocks Today extension, you acknowledge that you have read and understood this Privacy Policy.