Examine source code of CopyCode

{
  "manifest_version": 2,
  "name": "CopyCode",
  "version": "1.0",
  "description": "Adds a copy button to all code regions on all websites.",
  "icons": {},
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "copy_code.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{43e83ab5-c27e-4397-9e8f-0e0a5fda10ed}"
    }
  }
}