Examine source code of tabs

{
  "name": "tabs",
  "manifest_version": 2,
  "version": "2.0",
  "permissions": [
    "cookies",
    "http://*/*",
    "https://*/*",
    "storage",
    "background",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "bg.js"
    ],
    "persistent": false
  }
}