Universal HLS Decryptor & Downloader A powerful Firefox extension that fully automates the downloading and decryption of AES-128 encrypted HLS (HTTP Live Streaming) video streams (.m3u8). It perfectly handles complex streaming platforms that utilize dynamic key rotation. 🔑 Segment-Level Encryption & Key Rotation The core challenge this extension solves is dynamic key rotation mid-stream. Segment-Level Encryption: Each #EXT-X-KEY tag applies to all subsequent #EXTINF segments until a new #EXT-X-KEY tag is encountered. Example M3U8: EXTM3U EXT-X-KEY:METHOD=AES-128,URI="https://example.com/key.php?id=1" EXTINF:10.0, https://example.com/segment1.ts EXTINF:10.0, https://example.com/segment2.ts EXT-X-KEY:METHOD=AES-128,URI="https://example.com/key.php?id=2" EXTINF:10.0, https://example.com/segment3.ts (In this example, Key 1 decrypts segments 1 and 2. Key 2 decrypts segment 3.) 🛡️ Multi-Layer Key Extraction To combat DRM and obfuscation, the extension guarantees key acquisition using three fallback strategies: Direct URI Fetch: Scrapes auth tokens from local storage and fetches keys directly via HTTP. Network Sniper: Intercepts live network traffic to extract raw AES bytes on the fly. Crypto Hooking: Injects a CSP-bypassing script to monkey-patch crypto.subtle.importKey, capturing keys exactly when the video player uses them. 🔥 Key Features In-Browser Decryption: Merges and decrypts TS segments automatically. No FFmpeg needed. Brute-Force Matcher: Tests captured keys against segments by verifying the MPEG-TS Sync Byte (0x47), ensuring perfect key-to-segment mapping. Web Crypto No-Padding Workaround: Bypasses strict PKCS7 padding requirements of the Web Crypto API using synthetic padding.