Examine source code of Beautiful orange gradient

{
  "name": "Beautiful orange gradient",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "1118.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(8, 3, 1, 1)",
      "toolbar_field_text": "rgba(5, 0, 0, 1)",
      "tab_line": "rgba(224, 93, 54, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d6552947-e3f7-4229-af78-fe2f196f3531}"
    }
  }
}