Examine source code of Social network chat idle

{
  "manifest_version": 2,
  "name": "Social network chat idle",
  "version": "1.3resigned1",
  "icons": {
    "128": "icon128.png"
  },
  "description": "Keeps you idle in chat in social networks whose names start with “Fa” and end with “ook”, even during active conversations.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.facebook.com/*"
  ],
  "author": "Chris Pacejo",
  "browser_specific_settings": {
    "gecko": {
      "id": "{18629bd8-2aee-4f7b-a5ac-8568c8759672}"
    }
  }
}