Examine source code of azulgris

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "azulcielo",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-009-f069b97f439938a011297c84464f0df6.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(53, 64, 83)",
      "toolbar_text": "rgb(1, 1, 1)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(242, 239, 239)",
      "toolbar_field": "rgb(128, 128, 138)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(108, 127, 161)",
      "popup": "rgb(128, 128, 138)",
      "popup_text": "rgb(1, 1, 1)",
      "button_background_hover": "rgb(128, 128, 138)",
      "icons": "rgb(183, 176, 176)",
      "popup_border": "rgb(0, 0, 0)",
      "tab_selected": "rgb(124, 140, 171)",
      "toolbar_bottom_separator": "rgb(0, 0, 0)",
      "toolbar_field_border": "rgb(1, 1, 1)",
      "toolbar_top_separator": "rgb(0, 0, 0)",
      "tab_loading": "rgb(108, 127, 161)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0458be48-ab82-4126-90b5-8650030391f6}"
    }
  }
}