Examine source code of Verify Me

{
  "manifest_version": 2,
  "name": "Verify Me",
  "short_name": "Verify Me",
  "description": "Add a button to the browser to check rel=me links point back",
  "version": "0.3.3resigned1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content-scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_idle",
      "css": [
        "balloons.css"
      ],
      "js": [
        "balloons.js"
      ]
    }
  ],
  "permissions": [
    "http://*/",
    "https://*/"
  ],
  "browser_action": {
    "default_title": "Check rel-me links on this page.",
    "default_icon": {
      "16": "icons/icon16.png",
      "19": "icons/icon19.png",
      "32": "icons/icon32.png",
      "38": "icons/icon38.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png",
    "256": "icons/icon256.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a79f988e-8bfa-4494-ac77-697bbd1e86a7}"
    }
  }
}