Examine source code of Quick Emojis v2

{
  "manifest_version": 2,
  "name": "Quick Emojis",
  "version": "1.0",
  "description": "Adds a quick emoji menu to your browser toolbar to easily copy and use emojis anywhere.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{66bcc022-ec76-446a-b76a-87e5fde0d7bb}"
    }
  }
}