Examine source code of Black Kitten Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Black Kitten Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ],
      "color_scheme": "dark",
      "content_color_scheme": "dark"
    },
    "colors": {
      "toolbar": "rgba(18, 22, 40, 0.4)",
      "toolbar_text": "rgba(230, 240, 255, 0.9)",
      "frame": "rgb(10, 12, 22)",
      "tab_background_text": "rgba(140, 156, 189, 0.8)",
      "toolbar_field": "rgba(14, 17, 29, 0.8)",
      "toolbar_field_text": "rgb(220, 235, 255)",
      "tab_line": "rgb(100, 180, 255)",
      "popup": "rgba(12, 15, 26, 0.98)",
      "popup_text": "rgb(210, 225, 250)",
      "button_background_active": "rgba(100, 180, 255, 0.28)",
      "button_background_hover": "rgba(100, 180, 255, 0.18)",
      "frame_inactive": "rgb(15, 17, 28)",
      "icons": "rgb(140, 190, 255)",
      "ntp_text": "rgb(180, 200, 240)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "sidebar_border": "rgba(100, 180, 255, 0.2)",
      "sidebar_text": "rgba(210, 225, 250, 0.9)",
      "sidebar": "rgb(10, 12, 22)",
      "tab_selected": "rgba(26, 31, 56, 0.8)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "tab_loading": "rgb(120, 220, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "black-kitten-theme@qoneqo.github.io"
    }
  }
}