Examine source code of Mellow Light Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Mellow Light",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(247, 247, 247)",
      "toolbar_text": "rgb(77, 75, 101)",
      "frame": "rgb(247, 247, 247)",
      "tab_background_text": "rgb(77, 75, 101)",
      "toolbar_field": "rgb(230, 230, 231)",
      "toolbar_field_text": "rgb(77, 75, 101)",
      "tab_line": "rgb(23, 76, 151)",
      "popup": "rgb(230, 230, 231)",
      "popup_text": "rgb(77, 75, 101)",
      "button_background_hover": "rgb(211, 211, 212)",
      "tab_selected": "rgb(230, 230, 231)",
      "tab_text": "rgb(157, 157, 160)",
      "tab_loading": "rgb(23, 76, 151)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{acefa0c3-efdb-4065-82fe-0badf10fd235}"
    }
  }
}