Examine source code of JS Cube

{
  "name": "JS Cube",
  "version": "1.0",
  "description": "Inject your own JS into specific websites!",
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "compat.js",
      "common.js",
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true,
    "browser_style": false,
    "chrome_style": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "images/ic_launcher_js72.png"
  },
  "icons": {
    "48": "images/ic_launcher_js48.png",
    "72": "images/ic_launcher_js72.png",
    "144": "images/ic_launcher_js144.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{9805bd00-d0a7-4e6b-9267-39053437b622}",
      "strict_min_version": "57.0"
    }
  }
}