QualityBuffer

Unlocks multi-minute 4K YouTube pre-buffering, hardware VP9 decoding, and high-speed HLS/MP4 web video downloading.

QualityBuffer is an open-source, lightweight Chrome extension designed to eliminate buffering, stuttering, and sudden quality drops on high-definition web videos (4K, 2K, and 1080p). What it does: Deep Pre-Buffering (Up to 180s): Expands the standard buffer ceiling to 512 MB, loading 60s, 120s, or 180s ahead so playback never stalls. Hardware GPU Decoding: Forces VP9 SDR codec priority, relieving your CPU from heavy AV1 software decoding to prevent overheating and frame drops. Instant Seeking: Jump forward or backward through cached minutes instantly with zero load time. Web Media Downloader: Built-in tool to detect and save supported web videos (MP4) or extract audio tracks (MP3) in 1 click. Zero-Reload Dynamic Changes: Switch target resolution and buffer size instantly without refreshing the tab. Live Telemetry HUD: Monitor active resolution, current codec, buffered seconds, and network speed in real time. Quick Start: Pin the extension to your toolbar. Open any video page and click the extension icon. Select your target quality and buffer time, then click Apply Now. 100% Private & Open Source: Runs locally, contains no ads or tracking, and the code is fully auditable on GitHub.