Bilibili Mobile Edge extension security report

Bilibili Mobile is a Chromium browser extension (version 1.0.6) designed to enhance the mobile browsing experience on Bilibili.com. The extension modifies the user agent to ensure optimal compatibility and implements custom UI enhancements across different Bilibili domains. Key Features: - User Agent Modification : Uses declarativeNetRequest API to set a desktop Chromium Browser user agent for all Bilibili domains, ensuring proper page rendering - Domain-Specific Styling : Applies different CSS modifications for three main areas: - General Bilibili pages (mobile-styles.css) - Message/chat pages (message-pc.css + mobile-styles.css) - Timeline pages at t.bilibili.com (t-bilibili.com.css) - Fullscreen Functionality : Advanced content script with MutationObserver that dynamically adds fullscreen toggle buttons to chat interfaces, with fallback click listeners for sidebar interactions - Responsive Design : Custom CSS ensures mobile-friendly layouts and improved user experience Technical Architecture: - Manifest V3 extension with service worker background script - Content scripts injected at document_start for immediate DOM manipulation - Popup interface for user interaction - Comprehensive permission model for cross-domain functionality The extension transforms Bilibili's web interface to be more mobile-friendly while maintaining full functionality.