Examine source code of WordPress Admin Bar Toggle

{
  "manifest_version": 2,
  "name": "WordPress Admin Bar Toggle",
  "version": "1.0",
  "description": "Toggle the WordPress admin bar visibility with a single click!",
  "author": "Bart Wiggers",
  "background": {
    "scripts": [
      "lib/main.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "24": "img/icon24.png",
      "48": "img/icon48.png",
      "128": "img/icon128.png"
    },
    "default_title": "WP Admin Bar Toggle"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "css": [
        "lib/hide-admin-bar.css"
      ],
      "js": [
        "lib/content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "24": "img/icon24.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "permissions": [
    "storage",
    "*://*/*",
    "tabs"
  ],
  "web_accessible_resources": [
    "img/icon24.png",
    "img/icon48.png",
    "img/icon128.png",
    "img/icon24_red.png",
    "img/icon48_red.png",
    "img/icon128_red.png"
  ],
  "short_name": "WP Admin Bar Toggle",
  "applications": {
    "gecko": {
      "id": "wordpress-admin-bar-toggle@bartwiggers.com"
    }
  }
}