Examine source code of Swiss Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Swiss Dark",
  "description": "Dark theme inspired by jonaskohl.de",
  "homepage_url": "https://jonaskohl.de/",
  "browser_specific_settings": {
    "gecko": {
      "id": "{d5b92ce0-e866-4387-8e0c-51e389967a16}"
    }
  },
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(1, 13, 39)",
      "toolbar_text": "rgb(94, 120, 228)",
      "frame": "rgb(1, 13, 39)",
      "tab_background_text": "rgb(127, 134, 155)",
      "toolbar_field": "rgb(33, 40, 56)",
      "toolbar_field_text": "rgb(223, 220, 213)",
      "tab_line": "rgb(94, 120, 228)",
      "popup": "rgb(84, 92, 114)",
      "popup_text": "rgb(223, 220, 213)",
      "frame_inactive": "rgb(33, 40, 56)",
      "icons_attention": "rgb(228, 94, 134)",
      "icons": "rgb(223, 220, 213)",
      "ntp_background": "rgb(1, 13, 39)",
      "ntp_text": "rgb(223, 220, 213)",
      "popup_border": "rgb(1, 13, 39)",
      "popup_highlight_text": "rgb(1, 13, 39)",
      "popup_highlight": "rgb(94, 120, 228)",
      "sidebar_border": "rgb(1, 13, 39)",
      "sidebar_highlight_text": "rgb(1, 13, 39)",
      "sidebar_highlight": "rgb(94, 120, 228)",
      "sidebar_text": "rgb(223, 220, 213)",
      "tab_loading": "rgb(94, 120, 228)"
    }
  }
}