Examine source code of Claude Plum Dark

{
  "manifest_version": 2,
  "name": "Claude Plum Dark",
  "version": "1.0.0",
  "description": "Unofficial Firefox theme in the colours of Anthropic's Claude, not affiliated with or endorsed by Anthropic.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{3f1c7d2a-8e4b-4c6d-9a5e-2b7f0c1d8e94}"
    }
  },
  "theme": {
    "colors": {
      "frame": "#141413",
      "frame_inactive": "#141413",
      "tab_background_text": "#e1e0d9",
      "tab_selected": "#5852a2",
      "tab_text": "#e1e0d9",
      "tab_line": "#141413",
      "tab_loading": "#827dbd",
      "toolbar": "#1a1918",
      "toolbar_text": "#e1e0d9",
      "bookmark_text": "#e1e0d9",
      "toolbar_bottom_separator": "#262624",
      "toolbar_top_separator": "#30302e",
      "toolbar_vertical_separator": "#30302e",
      "toolbar_field": "#262624",
      "toolbar_field_text": "#e1e0d9",
      "toolbar_field_border": "#3d3d3a",
      "toolbar_field_focus": "#262624",
      "toolbar_field_text_focus": "#e1e0d9",
      "toolbar_field_border_focus": "#5852a299",
      "toolbar_field_highlight": "#827dbd66",
      "toolbar_field_highlight_text": "#e1e0d9",
      "popup": "#262624",
      "popup_text": "#e1e0d9",
      "popup_border": "#30302e",
      "popup_highlight": "#827dbd66",
      "popup_highlight_text": "#e1e0d9",
      "sidebar": "#1a1918",
      "sidebar_text": "#e1e0d9",
      "sidebar_border": "#30302e",
      "sidebar_highlight": "#827dbd66",
      "sidebar_highlight_text": "#e1e0d9",
      "ntp_background": "#1f1e1d",
      "ntp_text": "#e1e0d9",
      "ntp_card_background": "#262624",
      "icons": "#8f8f85",
      "icons_attention": "#827dbd",
      "button_background_hover": "#827dbd4d",
      "button_background_active": "#827dbd66"
    },
    "properties": {
      "color_scheme": "system"
    }
  }
}