Examine source code of Hide Facebook Chat

{
  "manifest_version": 2,
  "name": "Hide Facebook Chat",
  "version": "1.1resigned1",
  "description": "Very simple extension that hides the chat from Facebook",
  "content_scripts": [
    {
      "matches": [
        "https://www.facebook.com/*"
      ],
      "js": [
        "chat-eater.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{79275edf-1a72-466e-ae58-03902bd94d06}"
    }
  }
}