Examine source code of Easter Cross

{
  "name": "Easter Cross",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "Easter2.jpg"
    },
    "colors": {
      "frame": "rgba(72, 11, 122, 0)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(105, 15, 194, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7bd5fe49-afce-4df9-8b06-0cf8533333c0}"
    }
  }
}