Examine source code of Submoji

{
  "manifest_version": 2,
  "name": "Submoji",
  "description": "Quick and easy emoji typing and substitution",
  "version": "0.1.3resigned1",
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon@2x.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./lib/sanitizer.js",
        "./emoji-map.js",
        "./suggestion-box.js",
        "./substitute.js"
      ],
      "css": [
        "./suggestions.css",
        "suggestion-box.css"
      ]
    }
  ],
  "permissions": [
    "https://unicode.org/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cfe3c103-2c21-4f0e-ab09-89ca7a808185}"
    }
  }
}