Examine source code of Notify Me!

{
  "manifest_version": 2,
  "name": "Notify Me!",
  "version": "1.0",
  "description": "A web browser extension which notifies contestants when there are announcements on VJudge.net running contests, instead of wasting time reloading pages and looking for them periodically.",
  "icons": {
    "16": "icon.ico",
    "32": "icon.ico",
    "48": "icon.ico",
    "128": "icon.ico"
  },
  "background": {
    "scripts": [
      "vjudge.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://vjudge.net/*"
      ],
      "run_at": "document_start",
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "options.html",
    "default_icon": {
      "16": "icon.ico",
      "32": "icon.ico",
      "48": "icon.ico",
      "128": "icon.ico"
    },
    "default_title": "Notify Me!"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "permissions": [
    "storage",
    "tabs",
    "webRequest",
    "*://vjudge.net/*"
  ]
}