Examine source code of Capture icon

{
  "manifest_version": 2,
  "name": "Capture icon",
  "version": "1.0",
  "description": "The grasp symbol is often used to represent the idea of ​​receiving, understanding, seizing an opportunity, or being quick...",
  "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": "{c918ed28-e4ce-4807-8879-2dd44260f9fe}"
    }
  }
}