Examine source code of Fire Colors

{
  "name": "Fire Colors",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "IntoRedsH.jpg"
    },
    "colors": {
      "frame": "rgba(122, 21, 7, 1)",
      "tab_background_text": "rgba(250, 250, 0, 1)",
      "toolbar": "rgba(122, 24, 7, 0)",
      "bookmark_text": "rgba(255, 255, 0, 1)",
      "toolbar_field": "rgba(122, 24, 7, 0.1)",
      "toolbar_field_text": "rgba(255, 255, 0, 1)",
      "tab_line": "rgba(255, 255, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8a8bca1b-32ea-4792-b4c2-ebc63c505cc3}"
    }
  }
}