Examine source code of No emojis

{
  "manifest_version": 2,
  "name": "No emojis",
  "version": "1.0",
  "description": "Removes all emojis from all websites",
  "homepage_url": "https://sharpness5.duckdns.org/noemoji/",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "No emojis",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "inject.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "popup.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a63657d4-a45b-4d32-8ef4-3cacc0fcee36}"
    }
  }
}