Examine source code of hologram icon

{
  "manifest_version": 2,
  "name": "hologram icon",
  "version": "1.0",
  "description": "Hologram icons are often used to refer to the technology of displaying 3D stereoscopic images in space or to demonstrate holographic features on devices.",
  "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": "{7e996f3b-e600-4e27-88df-a8e0a0cd6a78}"
    }
  }
}