Examine source code of customizer

{
  "manifest_version": 2,
  "name": "customizer",
  "version": "1.0.2",
  "description": "Improve your browsing experience",
  "icons": {
    "16": "images/Wrench.png",
    "48": "images/wrench-icon-36416.png",
    "128": "images/lin_agt_wrench.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "css": [
        "styles.css"
      ],
      "js": [
        "conten_no_jq.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end"
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{d39b60f4-e91f-4776-b344-5263fdbc0fef}"
    }
  }
}