Examine source code of Everything Dark NoBorder

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Everything Dark NoBorder",
  "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(228, 228, 228)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(140, 140, 140)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(134, 129, 129, 0)",
      "popup": "rgb(33, 33, 33)",
      "popup_text": "rgb(228, 228, 228)",
      "popup_border": "rgba(140, 140, 140, 0.65)",
      "popup_highlight": "rgba(140, 140, 140, 0.5)",
      "tab_selected": "rgba(45, 45, 45, 0.57)",
      "toolbar_field_border_focus": "rgba(140, 140, 140, 0.65)",
      "toolbar_field_border": "rgba(140, 140, 140, 0.52)",
      "toolbar_field_highlight": "rgb(104, 104, 104)",
      "tab_loading": "rgba(134, 129, 129, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c0cf3f02-04c5-4a63-b037-f12cb0b9e950}"
    }
  }
}