Examine source code of Ffox colors

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Ffox colors",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-009-f069b97f439938a011297c84464f0df6.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(255, 103, 42)",
      "toolbar_text": "rgb(245, 213, 70)",
      "frame": "rgb(255, 167, 26)",
      "tab_background_text": "rgb(117, 93, 235)",
      "toolbar_field": "rgb(89, 69, 186)",
      "toolbar_field_text": "rgb(225, 139, 255)",
      "tab_line": "rgb(227, 143, 24)",
      "popup": "rgb(255, 180, 55)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(227, 143, 24)"
    }
  }
}