Examine source code of CopyToClip

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "CopyToClip For Stackoverflow",
  "content_scripts": [
    {
      "matches": [
        "*://*.stackoverflow.com/*"
      ],
      "js": [
        "copyToClip.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "19": "copy-19.png",
      "38": "copy-38.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fa81e875-4a84-4219-93f4-5ac5848fdf75}"
    }
  }
}