What is umbra?

Umbra EQ is a browser extension for Chrome, Edge, and Opera that lets you adjust the sound of whatever tab you are listening to, right there in your browser. It fixes common problems like thin bass on laptop speakers, videos mixed too quietly, or audio that sounds too harsh, and it works even on sites where many other equalizer extensions stop working, such as Netflix and Spotify. At its core is an 11 band adjustable equalizer where you drag points on a curve to boost or cut different frequencies while the audio plays. You can set one sound profile for every tab, or create rules so specific sites always use their own settings, with each tab keeping its own separate audio settings. It also includes bass boost, the ability to push volume past 100 percent, and a limiter that keeps loud boosts from distorting or clipping. Several ready made presets are included, like Bass Boost, Vocal, and Movie, and you can save and share your own. Everything happens locally on your computer. There is no account to create, no network requests are made, no audio is ever recorded or sent anywhere, and there is no analytics tracking. The easiest way to install it is through the Chrome Web Store with one click and automatic updates. On Edge or Opera, or if you want to build it yourself, you download a release file, turn on Developer mode in your browser's extensions page, and load the built folder directly. Under the hood, the extension uses Chrome's Manifest V3 system. A React and TypeScript popup decides which settings apply to each tab, while a separate background process handles the actual audio processing using the Web Audio API. Firefox support is planned but not yet available, since it needs a different technical approach. The project is open source under the MIT license.