Examine source code of Infrared icon

{
  "manifest_version": 2,
  "name": "Infrared icon",
  "version": "1.0",
  "description": "Infrared symbol is a symbol representing technology using infrared rays, often seen in: Remote controls, motion sensors, temperature...",
  "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": "{38093e56-566f-4085-8095-219c198d0cb2}"
    }
  }
}