Examine source code of Bug icon

{
  "manifest_version": 2,
  "name": "Bug icon",
  "version": "1.0",
  "description": "The insect icon can be used in designs, games, lessons or materials related to nature, environment, technology.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Click me!"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{74b1a3ae-d5f1-4bea-be53-a7e8ae836280}"
    }
  }
}