Examine source code of Culligan Water Filter

{
  "manifest_version": 2,
  "name": "Culligan Water Filter",
  "description": "This is the description",
  "version": "0.1",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./emojiMap.js",
        "./substitute.js"
      ]
    }
  ]
}