Examine source code of Stationery Icons

{
  "manifest_version": 2,
  "name": "Stationery Icons",
  "version": "1.0",
  "description": "Stationery icons are commonly used to represent items such as: pens, notebooks, paper clips, pins, rulers, scissors, glue, etc.",
  "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": "{675e2955-83cb-414d-9941-1f1774325585}"
    }
  }
}