Examine source code of Github Emoji Commits

{
  "manifest_version": 2,
  "name": "Emojico",
  "version": "1.0",
  "description": "Converts the Emojico website into a Firefox extension",
  "icons": {
    "149": "icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "https://emojico.vercel.app/*"
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{37649a95-96fc-4091-a066-1ec446fb4451}"
    }
  }
}