Examine source code of Twitter Cut Tags

{
  "manifest_version": 2,
  "name": "Twitter Cut Tags",
  "version": "1.1resigned1",
  "description": "Puts LJ style cut tags around tweets more than 140 characters long.",
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*",
        "*://twitter.com/*"
      ],
      "js": [
        "cuttag.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{61e9e838-c37d-4c41-8230-5b75a2dd0768}"
    }
  }
}