🔍 What it does

• Automatically detects DOI on academic pages
• Checks Unpaywall API for legal open access versions
• Falls back to alternative sources when needed
• Shows floating button with color-coded quality indicators
• One-click access to available papers

## ✨ Features
- Smart Source Prioritization: Legal sources first, alternatives as fallback
- Visual Indicators: Color-coded buttons showing source quality
- Cross-browser Support: Works on Chrome and Firefox
- Lightweight: Minimal performance impact
- Auto-detection: No manual input required

🎨 Quality Tiers

• 🟢 Tier S (Green): Gold/Hybrid Open Access
• 🟡 Tier A (Light Green): Bronze Open Access
• 🟠 Tier B (Yellow): Alternative sources
• 🔵 Tier C (Blue): Repository versions
• ⚫ Disabled (Gray): No copy found

🛠️ Technical Stack

• TypeScript + Rollup
• Manifest V3 (Chrome) / V2 (Firefox)
• Modern ES6 modules
• CSS-in-JS styling