Examine source code of YAAMUTE

{
  "name": "YAAMUTE",
  "version": "0.1.0",
  "description": "Yet another auto mute extension",
  "manifest_version": 2,
  "icons": {
    "48": "src/images/icons/icon-48.png",
    "96": "src/images/icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "yaamute@fazekmar",
      "strict_min_version": "68.0"
    }
  },
  "permissions": [
    "storage",
    "menus",
    "tabs"
  ],
  "options_ui": {
    "page": "src/options/options.html"
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  }
}