Examine source code of ClickSafe

{
  "manifest_version": 2,
  "name": "ClickSafe",
  "version": "1.0",
  "description": "A simple extension to highlight potential click-jacking vulnerabilities by adding a red border to vulnerable webpages.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4909ecc5-63e7-4d8e-917c-f7ab9d5a97a6}"
    }
  }
}