Table of Contents
1. Introduction
Stock Market Today ("we", "our", "the extension") is a Chrome extension designed to provide real-time stock market information to users. We are committed to protecting your privacy and being transparent about our data practices.
Privacy-First Approach
We DO NOT collect, store, transmit, or sell any personal information.
2. Data Collection
2.1 What We Access
- Public Financial Market Data: The extension fetches publicly available stock market data from Yahoo Finance API
- Local Storage: Cached market data is stored locally on your device for faster loading and offline access
2.2 What We DO NOT Collect
- Personal identification information (name, email, phone number)
- Browsing history or website visits
- Cookies from other websites
- Login credentials or passwords
- Payment or financial account information
- Geographic location or IP address
- Camera, microphone, or device sensors
- Contacts, calendar, or personal files
- User behavior analytics or tracking data
2.3 Data Storage
| Data Type | Storage Location | Duration | Purpose |
|---|---|---|---|
| Stock Prices | Local Device Only | 5 minutes | Performance optimization |
| Market Indices | Local Device Only | 5 minutes | Quick data access |
| Last Update Timestamp | Local Device Only | Until next refresh | Display freshness |
3. Permissions Explained
Chrome requires us to declare permissions. Here's exactly why we need each one and how we use them:
Storage Permission
What it allows: Saving data locally on your device using Chrome's Storage API
Why we need it: To cache stock market data temporarily for improved performance and offline access
What we store:
- Stock symbols (e.g., AAPL, MSFT, ^GSPC)
- Current stock prices
- Price changes and percentages
- Timestamp of last data fetch
Access: Only this extension can access this data. It stays on your device and is never transmitted to us or any third party.
Host Permission: query1.finance.yahoo.com
What it allows: Making API requests to Yahoo Finance servers
Why we need it: To fetch real-time stock market data from Yahoo Finance's public API
Data sent: Only stock ticker symbols (e.g., AAPL, GOOGL, ^GSPC)
Data received: Public market data including prices, changes, and trading volumes
Frequency: Every 5 minutes when the extension is active, or when you manually refresh
4. Third-Party Services
4.1 Yahoo Finance API
We use Yahoo Finance's public API to retrieve stock market data. This is publicly available information that anyone can access.
- Service Provider: Yahoo (Verizon Media)
- Data Accessed: Public stock prices and market indices
- Personal Data Shared: None
- Privacy Policy: Yahoo Privacy Policy
4.2 Alpha57.com
The extension includes a link to Alpha57.com for additional market analysis. This is a standard hyperlink that opens in a new browser tab.
- Automatic Data Sharing: None - data is only shared if you click the link
- What Happens: Clicking opens Alpha57.com in a new tab like any website link
- Privacy Policy: Alpha57.com's privacy policy applies when you visit their website
4.3 No Analytics or Tracking
We do NOT use:
- Google Analytics or any analytics services
- Third-party advertising networks
- Tracking pixels or beacons
- Social media plugins that track users
- Error reporting services that collect personal data
5. Google API Services User Data Policy Compliance
Our use of information received from Google APIs adheres to the Google API Services User Data Policy , including the Limited Use requirements.
Chrome APIs Used
This extension uses the following Chrome APIs:
- chrome.storage: For local data caching only
- chrome.runtime: For extension lifecycle management
- chrome.tabs: Only to open Alpha57.com on first install
5.1 Limited Use Policy Compliance
We certify that:
- We only request permissions that are critical to the extension's core functionality
- We do not transfer user data to third parties except as necessary to provide the service
- We do not use user data for serving advertisements
- We do not allow humans to read user data, except with explicit user consent or as required by law
- All data handling is transparent and disclosed in this privacy policy
5.2 Data Handling Certification
| Requirement | Our Compliance |
|---|---|
| Transparent privacy disclosures | ✓ This comprehensive privacy policy |
| Limited data collection | ✓ Only public market data, no personal info |
| Secure data handling | ✓ All data stored locally, encrypted by Chrome |
| No sale of user data | ✓ No data collection means nothing to sell |
| No use for advertising | ✓ Extension contains zero ads |
| No unauthorized transfer | ✓ No data leaves your device |
5.3 Chrome Web Store Developer Program Policies
This extension complies with all Chrome Web Store Developer Program Policies :
- Single Purpose: Real-time stock market data tracking
- Minimal Permissions: Only storage and Yahoo Finance API access
- User Privacy: Zero personal data collection
- Security: No code obfuscation, all code is reviewable
- Deceptive Behavior: Transparent about all features and permissions
6. Data Security
While we don't collect personal data, we still implement security best practices:
6.1 Technical Measures
- Local Storage Only: All cached data stays on your device
- No Remote Servers: We don't operate servers that store user data
- HTTPS Only: All API calls use secure HTTPS connections
- Chrome Sandboxing: Extension runs in Chrome's security sandbox
- Content Security Policy: Prevents unauthorized code execution
6.2 Code Transparency
- No code obfuscation - all JavaScript is readable
- Open for review by Chrome Web Store security team
- Minimal external dependencies
- Regular security updates
7. User Control
You have complete control over the extension and your data:
7.1 Managing the Extension
- Disable: Go to chrome://extensions/ and toggle the extension off
- Remove: Click "Remove" to uninstall completely
- Review Permissions: View all permissions on the extensions page
7.2 Data Management
- Clear Cache: Uninstalling the extension removes all cached data
- View Storage: Use Chrome DevTools to inspect local storage
- Prevent Storage: Disable the extension to stop data caching
7.3 Your Rights
Under applicable data protection laws, you have the right to:
- Know what data is collected (disclosed in this policy)
- Access your data (view Chrome local storage)
- Delete your data (uninstall extension)
- Opt-out completely (uninstall extension)
- Request information (contact us via Alpha57.com)
8. Children's Privacy
This extension is designed for adults interested in financial markets. We do not knowingly collect information from children under 13 years of age.
If you are a parent or guardian and believe your child has provided information through this extension, please contact us immediately so we can address the issue.
COPPA Compliance: This extension complies with the Children's Online Privacy Protection Act (COPPA) by not collecting any personal information from users of any age.
9. Changes to This Policy
We may update this privacy policy to reflect changes in our practices or legal requirements. When we make changes:
- The "Last Updated" date at the top will be revised
- Significant changes will be highlighted in the extension update notes
- Continued use after changes constitutes acceptance of the updated policy
- Users can always access the current policy at this URL
10. Contact Information
If you have questions, concerns, or requests regarding this privacy policy or our data practices, please contact us:
Website: https://www.alpha57.com
Extension Support: Through Chrome Web Store reviews or Alpha57 contact page
Response Time: We aim to respond within 48 hours
Summary
In Plain English:
Stock Market Today is a simple extension that shows you stock market data. It only accesses public stock prices from Yahoo Finance and temporarily saves them on your computer for faster loading. We don't collect any information about you, we don't track you, and we don't show ads. Your privacy is completely protected.