Examine source code of Copy icon

{
  "manifest_version": 2,
  "name": "Copy icon",
  "version": "1.0",
  "description": "The copy icon is an icon that represents the action of copying data such as text, images, files to the clipboard so that it can be pasted to another location.",
  "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": "{1d0fe1a1-158c-48ff-8f37-bb3bf3766df8}"
    }
  }
}