Leta Go UltraWide by LetaLab.eu

Leta Go UltraWide automatically detects black bars around a playing video and adjusts the picture to fill the visible area. It supports auto‑detect, fixed aspect ratios, zoom, stretch mode, and alignment options. The extension works on all major streaming sites and self‑hosted players, requires no configuration, stores only five local settings, and never collects or transmits any data. Everything runs entirely inside your browser for maximum privacy and security.