Examine source code of LiveReload

{
  "manifest_version": 2,
  "name": "LiveReload",
  "version": "20.3.0",
  "background": {
    "scripts": [
      "global.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "injected.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "livereload.js"
  ],
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_title": "Enable LiveReload",
    "default_icon": "IconDisabled.svg",
    "theme_icons": [
      {
        "dark": "IconDisabled.svg",
        "light": "IconDisabled-dark.svg",
        "size": 32
      }
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{49f12380-d939-4123-be45-00b5e540c629}"
    }
  }
}