Examine source code of Letter 4 You

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#cdd5d6",
      "tab_background_text": "#166e2b"
    }
  },
  "version": "2.0",
  "name": "Letter 4 You",
  "manifest_version": 2,
  "description": "The letter claims the West is subject to a disinformation campaign from its politicians and criticizes Islamophobia in Western media."
}