Examine source code of Matte Black Browser Theme

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "theme-update",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(35, 35, 35)",
      "toolbar_text": "rgb(169, 169, 169)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(176, 176, 176)",
      "toolbar_field": "rgb(18, 18, 18)",
      "toolbar_field_text": "rgb(194, 194, 194)",
      "tab_line": "rgb(32, 32, 32)",
      "popup": "rgb(10, 10, 10)",
      "popup_text": "rgb(169, 169, 169)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(0, 0, 0)",
      "toolbar_top_separator": "rgb(33, 33, 33)",
      "tab_loading": "rgb(32, 32, 32)"
    }
  }
}