Examine source code of orange-rainbow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "orange-rainbow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-009-f069b97f439938a011297c84464f0df6.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(115, 51, 0)",
      "toolbar_text": "rgb(252, 174, 30)",
      "frame": "rgb(190, 85, 4)",
      "tab_background_text": "rgb(115, 51, 0)",
      "toolbar_field": "rgb(137, 49, 1)",
      "toolbar_field_text": "rgb(252, 174, 30)",
      "tab_line": "rgb(252, 174, 30)",
      "popup": "rgb(115, 51, 0)",
      "popup_text": "rgb(252, 174, 30)",
      "ntp_background": "rgb(137, 49, 1)",
      "ntp_text": "rgb(252, 174, 30)",
      "popup_border": "rgb(252, 174, 30)",
      "tab_loading": "rgb(252, 174, 30)"
    }
  }
}