Examine source code of Toothpaste icon

{
  "manifest_version": 2,
  "name": "Toothpaste icon",
  "version": "1.0",
  "description": "Toothpaste icons are often represented by a combination of a tube of toothpaste and a toothbrush, to clearly evoke the idea of ​​oral care.",
  "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": "{fcdca362-f366-478b-bbd2-0d17e999bab9}"
    }
  }
}