Examine source code of FTM Live

{
  "manifest_version": 2,
  "name": "FTM Live",
  "description": "FTM live is an app for decorating words with different colors, enhancing text visibility and aesthetics",
  "version": "1",
  "icons": {
    "128": "./icons/128x128.png"
  },
  "browser_action": {
    "default_icon": "./icons/128x128.png",
    "default_popup": "popup.html"
  },
  "permissions": [],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f9bb0604-e042-4cd4-9666-83ec74f5ed79}"
    }
  }
}