Examine source code of Dark Mode Gradient

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Low Taper Revival",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(52, 57, 61, 0.75)",
      "toolbar_text": "rgb(242, 249, 255)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(242, 249, 255)",
      "toolbar_field": "rgba(52, 57, 61, 0.9)",
      "toolbar_field_text": "rgb(242, 249, 255)",
      "tab_line": "rgb(52, 56, 61)",
      "popup": "rgb(52, 57, 61)",
      "popup_text": "rgb(242, 249, 255)",
      "toolbar_bottom_separator": "rgb(52, 57, 61)",
      "toolbar_field_border": "rgb(34, 37, 40)",
      "toolbar_top_separator": "rgb(34, 37, 40)",
      "toolbar_vertical_separator": "rgb(242, 249, 255)",
      "tab_loading": "rgb(52, 56, 61)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fadd2af6-feb2-4324-ab62-748b6846b3f0}"
    }
  }
}