Examine source code of Gift box icon

{
  "manifest_version": 2,
  "name": "Gift box icon",
  "version": "1.0",
  "description": "Gift box icon is used to represent gifts, rewards, offers, promotions, or festive occasions such as birthdays, Christmas, New Year.",
  "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": "{c6bbd253-d21f-4a40-80d4-20f0e152560d}"
    }
  }
}