Browser Border Theme is a browser extension that adds dynamic colored borders to web pages. The borders react to audio playing in the active tab, providing a visual music experience.
We do not collect, store, transmit, or share any personal data. This extension works entirely locally within your browser.
Permissions & What They Do
tabCapture — Captures audio from the active browser tab to analyze frequency data (bass, mid, treble, energy). This data is used only to animate the colored border. Audio is never recorded, stored, or sent anywhere.
offscreen — Creates an offscreen document to process the audio stream using the Web Audio API. No data leaves this document.
storage — Saves your preferences (theme, effect, on/off state) locally in your browser. No data is synced to external servers.
scripting — Injects the border UI into web pages.
activeTab — Accesses the current tab to apply the border effect.
Data Handling
No user data is collected
No analytics or tracking
No cookies
No external network requests
No server communication of any kind
Audio analysis happens locally and is discarded in real-time (not recorded)
Open Source
The source code of this extension is publicly available on GitHub for review: