Examine source code of Create a Emoji Generator

{
  "manifest_version": 2,
  "name": "Create a Emoji Generator",
  "version": "1.0",
  "description": "While communicating with our friends, we always use the emoji to represent our feelings and emojis. There are many emojis that represent our emotions and feelings. The Create an Emoji Generator utility makes it easier and more convenient than ever to create a custom face emoji.",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/em-logo.png"
    }
  },
  "icons": {
    "128": "images/em-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7c18902e-82bb-47c4-ab6c-f9e53b5ea179}"
    }
  }
}