Examine source code of French Grey

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "French Grey",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0.5)",
      "toolbar_text": "rgb(58, 58, 56)",
      "frame": "rgb(183, 190, 200)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(45, 170, 244)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(183, 190, 200)",
      "popup": "rgb(27, 170, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "icons": "rgb(8, 114, 176)",
      "ntp_background": "rgba(183, 190, 200, 0.3)",
      "ntp_text": "rgb(58, 58, 56)",
      "popup_border": "rgba(255, 255, 255, 0.5)",
      "sidebar_border": "rgb(83, 83, 83)",
      "sidebar_highlight_text": "rgb(27, 170, 255)",
      "tab_background_separator": "rgb(162, 186, 223)",
      "tab_selected": "rgb(45, 170, 244)",
      "tab_text": "rgb(240, 240, 240)",
      "toolbar_field_border_focus": "rgb(0, 0, 0)",
      "toolbar_field_focus": "rgb(162, 186, 223)",
      "tab_loading": "rgb(183, 190, 200)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f790f3c9-d490-4261-93d9-17fbc982ba82}"
    }
  }
}