Examine source code of Material White Productive

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Material White Productive",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-017-7074520d97b5c592d413aed5f115f093.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(255, 255, 255)",
      "toolbar_text": "rgb(73, 72, 72)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(84, 84, 84)",
      "toolbar_field": "rgb(253, 253, 253)",
      "toolbar_field_text": "rgb(69, 67, 67)",
      "tab_line": "rgb(24, 3, 212)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "ntp_background": "rgb(255, 255, 255)",
      "popup_border": "rgb(0, 0, 0)",
      "tab_selected": "rgb(255, 255, 255)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgb(255, 255, 255)",
      "tab_loading": "rgb(24, 3, 212)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1434615-632f-4d30-9873-16ee051fa5f3}"
    }
  }
}