Examine source code of javascript

{
  "manifest_version": 2,
  "name": "javascript",
  "description": "add javascript that will run on this domain",
  "version": "0.4.0",
  "icons": {
    "64": "icons/64.png",
    "512": "icons/512.png",
    "1052": "icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "unlimitedStorage"
  ],
  "background": {
    "scripts": [
      "background_script.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "64": "icons/64.png",
      "512": "icons/512.png",
      "1052": "icons/icon.png"
    },
    "default_popup": "browserAction/index.html",
    "default_title": "javascript"
  },
  "options_ui": {
    "page": "options/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d4bc778f-3a98-44f4-9b2e-45fab92a21db}"
    }
  }
}