Examine source code of Null-Stream Injector

{
  "manifest_version": 2,
  "name": "Null-Stream Injector",
  "version": "1.0",
  "description": "Keeps the DAC awake with a silent audio stream for certain sites.",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "Null-Stream Injector",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0a1d846c-c18d-4e3c-8281-dcb3fffcc251}"
    }
  }
}