Refererer

• Designed for web developers, security researchers, privacy enthusiasts, educators, and students to monitor HTTP Referer headers in real-time. • Captures URLs with their Referer headers for all web requests, providing an intuitive interface to debug navigation patterns, analyze Referer leaks, or learn about HTTP headers. • Copy output using Ctrl+A, Ctrl+C, or right-click for analysis in external tools. • Bold Referer lines, making them easy to distinguish from URLs. • Auto-scrolls to the latest entry.

Prioritizes security, user safety, and browser integrity, adhering to Mozilla’s standards: • Minimal Permissions, no unnecessary access to sensitive browser features or user data. • No Data Collection: Processes headers locally within the browser, with no data stored or transmitted externally, ensuring complete privacy. • Local Operation: Does not initiate external network requests or rely on APIs/servers. All processing (capturing headers, storing in browser.storage.local, rendering in the sidebar) occurs locally, allowing the add-on to function without external connectivity. Note: Header capture requires active web browsing, as it monitors user-initiated requests. • Safe DOM Manipulation: Avoids risky methods to prevent vulnerabilities. • No Third-Party Libraries: Built with pure JavaScript, HTML, and CSS, eliminating dependency vulnerabilities and reducing the attack surface. • Robust Error Handling. • Storage Security: temporarily stores headers, with no persistent storage of sensitive data.

User Precautions: • Referer Leaks: Be aware that Referer headers may contain sensitive information (e.g., URL query parameters). Copying and sharing sidebar content could inadvertently expose private data, so review copied text before sharing. • Higher Memory Usage: Since there is no limit on the number of captured Referer headers, extensive browsing may increase memory usage, especially on low-RAM systems (<8 GB). Monitor RAM usage and clear the sidebar as needed to optimize performance. • Temporary Add-On: As a temporary add-on, it requires manual reloading via about:debugging, which ensures no unintended background activity but may interrupt monitoring if not reloaded. • Browser Interactions: Other extensions (e.g., ad blockers, privacy tools) may modify Referer headers, affecting the add-on’s output. Disable conflicting extensions for accurate monitoring.

Limitations: The sidebar output may occasionally clear automatically due to browser or extension optimizations. Users should copy important data promptly to avoid loss. Possible reasons include: • Storage Reset: The background script may reset headers in browser.storage.local due to timeouts or internal limits. • Browser Memory Management: Firefox may clear DOM content or storage during garbage collection, especially under high memory pressure (e.g., with multiple remote processes). • Tab Suspension: Firefox’s resource-saving features may reset the sidebar’s state if not persisted robustly. • WebRequest Listener Issues: Network errors or tab reloads may cause the webRequest listener to reset the headers array. • Extension Logic: Unintended resets in the background script (e.g., error handling or session management) may clear the sidebar.