Examine source code of Script Runner

{
  "name": "Code Injector",
  "version": "2.1",
  "description": "Script injector for JavaScript and CSS!",
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "page_action": {
    "default_popup": "popup.html"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "options_page": "options.html",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "contentScript.css"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "icons": {
    "16": "/images/ico48.png",
    "32": "/images/ico48.png",
    "48": "/images/ico48.png",
    "128": "/images/ico48.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{80d1905d-fccd-495f-854f-303a964aa5e6}"
    }
  }
}