Examine source code of Emoji Pickers

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "128": "icon-128.png"
    },
    "default_popup": "popup.html",
    "default_title": "Emoji Search"
  },
  "description": "New Emoji keyboard you can add to your browser",
  "icons": {
    "128": "icon-128.png"
  },
  "manifest_version": 2,
  "name": "Emoji keyboard",
  "offline_enabled": true,
  "permissions": [
    "tabs",
    "storage",
    "idle",
    "<all_urls>"
  ],
  "version": "1.4"
}