Examine source code of twit-min

{
  "name": "twit-min",
  "version": "0.3resigned1",
  "manifest_version": 2,
  "description": "Minimizes things displayed on twitter.",
  "permissions": [],
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "applications": {
    "gecko": {
      "id": "devon@tek256.com"
    }
  }
}