Examine source code of Vantagraph Vanta Black

{
  "manifest_version": 2,
  "name": "Vantagraph Vanta Black",
  "description": "Pure black everywhere. Separation is done in shades of black, text stays readable white.",
  "author": "Miabeyefendi",
  "version": "1.0",
  "icons": {
    "32": "icon.svg"
  },
  "theme": {
    "properties": {
      "color_scheme": "dark",
      "content_color_scheme": "auto"
    },
    "colors": {
      "frame": "#000000",
      "frame_inactive": "#000000",
      "tab_background_text": "#8A8F8A",
      "tab_text": "#FFFFFF",
      "tab_selected": "#2A2A2A",
      "tab_line": "#B0B5B0",
      "tab_loading": "#B0B5B0",
      "toolbar": "#050505",
      "toolbar_text": "#FFFFFF",
      "toolbar_top_separator": "#1F1F1F",
      "toolbar_bottom_separator": "#1F1F1F",
      "toolbar_vertical_separator": "#1F1F1F",
      "toolbar_field": "#262626",
      "toolbar_field_text": "#FFFFFF",
      "toolbar_field_border": "#1F1F1F",
      "toolbar_field_focus": "#262626",
      "toolbar_field_text_focus": "#FFFFFF",
      "toolbar_field_border_focus": "#B0B5B0",
      "toolbar_field_highlight": "#404040",
      "toolbar_field_highlight_text": "#FFFFFF",
      "button_background_hover": "#141414",
      "button_background_active": "#262626",
      "icons": "#FFFFFF",
      "icons_attention": "#FF1040",
      "popup": "#0B0B0B",
      "popup_text": "#FFFFFF",
      "popup_border": "#1F1F1F",
      "popup_highlight": "#262626",
      "popup_highlight_text": "#FFFFFF",
      "sidebar": "#050505",
      "sidebar_text": "#FFFFFF",
      "sidebar_border": "#1F1F1F",
      "sidebar_highlight": "#262626",
      "sidebar_highlight_text": "#FFFFFF",
      "ntp_background": "#000000",
      "ntp_text": "#FFFFFF",
      "ntp_card_background": "#232323"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ec6c2f44-9a5e-4b15-83ae-df0951ee455c}"
    }
  }
}