Examine source code of MagicPass

{
  "manifest_version": 2,
  "name": "MagicPass",
  "version": "1.0",
  "description": "MagicPass is the perfect tool for make strong paswords. ",
  "icons": {
    "48": "assets/icons/globe.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "assets/icons/globe.png",
    "default_title": "Password creator",
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{39b90ba9-0fad-4ac0-9f3f-2d4368bc9bff}"
    }
  }
}