Examine source code of Github Dark High Contrast

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Github Dark High Contrast",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-009-f069b97f439938a011297c84464f0df6.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(225, 228, 232)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(225, 228, 232)",
      "tab_line": "rgb(36, 41, 46)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(225, 228, 232)",
      "sidebar_border": "rgb(112, 112, 112)",
      "sidebar_highlight_text": "rgb(57, 65, 74)",
      "sidebar_highlight": "rgb(57, 65, 74)",
      "sidebar_text": "rgb(209, 213, 218)",
      "tab_text": "rgb(225, 228, 232)",
      "toolbar_top_separator": "rgb(255, 255, 255)",
      "tab_loading": "rgb(36, 41, 46)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f91b2bd2-cebd-46e4-b51a-a2a3c37a8201}"
    }
  }
}