Examine source code of rank-shout

{
  "manifest_version": 2,
  "name": "Rank-shout",
  "description": "",
  "version": "1.0.3",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "128": "icon.png"
  },
  "background": {
    "persitent": false,
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.codechef.com/rankings/*"
      ],
      "js": [
        "content/codechef.js"
      ]
    },
    {
      "matches": [
        "*://codeforces.com/*/*/standings*"
      ],
      "js": [
        "content/codeforces.js"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "*://*.codechef.com/*",
    "*://*.codeforces.com/*",
    "notifications"
  ]
}