manifest.json

{
  "manifest_version": 2,

  "name": "Chrome Audio Capture",
  "description": "This extension captures the audio on the current tab and saves the output file on your computer when the capture is complete",
  "version": "2.0.0",
  "icons": {
    "128":"icon.png"
    },

  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Open Chrome Audio Capture interface"
  },
  "options_page": "options.html",
  "background": {
    "scripts": ["background.js", "worker.js"],
    "persistent": true
  },
  "permissions": [
    "tabs",
    "tabCapture",
    "downloads",
    "storage"
  ],
  "commands": {
    "startCaptureByShortcut": {
      "suggested_key": {
        "default": "Ctrl+Shift+U",
        "mac": "MacCtrl+U"
      },
      "description": "Start Capture"
    },
    "stopCaptureByShortcut": {
      "suggested_key": {
        "default": "Ctrl+Shift+I",
        "mac": "MacCtrl+I"
      },
      "description": "Stop Capture"
    }
  }
}