Examine source code of Unpin icon

{
  "manifest_version": 2,
  "name": "Unpin icon",
  "version": "1.0",
  "description": "The unpin icon is commonly used in apps, software, social media, or interface design (UI/UX) to indicate the action of unpinning a previously pinned item.",
  "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": "{7803741c-cdb7-4c6e-8e3e-82c4140f2085}"
    }
  }
}