Examine source code of Emoji Picker

{
  "manifest_version": 2,
  "name": "Emoji Picker",
  "version": "1.0",
  "author": "Cesar Carrillo",
  "description": "A simple and easy to use Emoji picker",
  "icons": {
    "48": "icons/icon-48x48.png"
  },
  "browser_action": {
    "default_icon": {
      "38": "icons/icon-38x38.png"
    },
    "default_title": "Emoji Picker",
    "default_popup": "main.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F"
      },
      "description": "Shortcut to show the menu"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c22b5515-d2af-44a2-a88c-206053b83057}"
    }
  }
}