Examine source code of low contrast light

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "low cantrast light",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-009-f069b97f439938a011297c84464f0df6.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(204, 204, 204)",
      "toolbar_text": "rgb(85, 85, 85)",
      "frame": "rgb(170, 170, 170)",
      "tab_background_text": "rgb(85, 85, 85)",
      "toolbar_field": "rgb(238, 238, 238)",
      "toolbar_field_text": "rgb(68, 68, 68)",
      "tab_line": "rgb(238, 238, 238)",
      "popup": "rgb(187, 187, 187)",
      "popup_text": "rgb(85, 85, 85)",
      "button_background_active": "rgb(221, 221, 221)",
      "button_background_hover": "rgb(238, 238, 238)",
      "icons": "rgb(85, 85, 85)",
      "tab_loading": "rgb(238, 238, 238)"
    }
  }
}