Examine source code of Ashes Dark

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "ashes-dark@krafting.net",
      "strict_min_version": "61.0"
    }
  },
  "name": "Ashes Dark",
  "version": "1.0.2",
  "description": "Ashes Dark theme for Firefox.",
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  },
  "theme": {
    "colors": {
      "tab_line": "#faa51b",
      "tab_background_text": "rgba(207, 218, 231, 0.8)",
      "frame": "#1f2225",
      "tab_loading": "#603ADA",
      "icons_attention": "#603ADA",
      "toolbar": "#2b2f33",
      "bookmark_text": "#D3DAE3",
      "toolbar_top_separator": "rgba(38, 42, 51, 0.97)",
      "toolbar_bottom_separator": "#2B2E39",
      "toolbar_vertical_separator": "#2B2E39",
      "toolbar_field": "#33373c",
      "toolbar_field_text": "#D3DAE3",
      "toolbar_field_focus": "rgba(255, 255, 255, 0.075)",
      "toolbar_field_border": "#1f2225",
      "toolbar_field_separator": "rgba(255, 255, 255, 0.2)",
      "toolbar_field_border_focus": "#faa51b",
      "button_background_hover": "#33373c",
      "button_background_active": "#faa51b",
      "popup": "#33373c",
      "popup_text": "#D3DAE3",
      "popup_border": "#2B2E39",
      "popup_highlight": "#603ADA",
      "popup_highlight_text": "#E3EAF3",
      "ntp_text": "#D3DAE3",
      "ntp_background": "#33373c",
      "sidebar": "#2b2f33",
      "sidebar_text": "#D3DAE3",
      "sidebar_border": "#2B2E39",
      "sidebar_highlight": "#603ADA",
      "sidebar_highlight_text": "#E3EAF3"
    }
  }
}