Examine source code of Coding Shout

{
  "name": "Coding Shout",
  "description": "Stop staring at your screen waiting for the result to pop up. Relax and let this extension notify you with the results",
  "version": "1.8resigned1",
  "manifest_version": 2,
  "icons": {
    "16": "icon_16.png",
    "32": "icon_32.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "applications": {
    "gecko": {
      "id": "codechef_shout@rishiraj.me"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.codeforces.com/*/my"
      ],
      "run_at": "document_idle",
      "js": [
        "codeforces.js"
      ]
    },
    {
      "matches": [
        "*://*.atcoder.jp/contests/*/submissions/me"
      ],
      "run_at": "document_idle",
      "js": [
        "atcoder.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_action": {
    "default_popup": "options.html",
    "default_icon": {
      "16": "icon_16.png",
      "32": "icon_32.png",
      "48": "icon_48.png",
      "128": "icon_128.png"
    }
  },
  "background": {
    "scripts": [
      "script.js"
    ],
    "persistent": true
  },
  "permissions": [
    "notifications",
    "storage",
    "webRequest",
    "*://*.codechef.com/submit/complete/*",
    "*://*.codechef.com/get_submission_status/*"
  ]
}