Examine source code of QuickEmoji

{
  "name": "QuickEmoji",
  "description": "Add a panel to quickly copy emojis to clipboard",
  "manifest_version": 2,
  "version": "1.0",
  "homepage_url": "https://github.com/sebarocks/QuickEmoji",
  "icons": {
    "48": "icons/qe-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/qe-32.png",
    "theme_icons": [
      {
        "light": "icons/qe-32-light.png",
        "dark": "icons/qe-32.png",
        "size": 32
      }
    ],
    "default_title": "QuickEmoji",
    "default_popup": "popup/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{903a9200-6a3c-450c-b453-32e6c3f8da4a}"
    }
  }
}