Examine source code of Light & Dark

// Sourced from:
// resource://default-theme/manifest.json
// resource://builtin-themes/light/manifest.json
// resource://builtin-themes/dark/manifest.json

{
  "name": "Light & Dark",
  "author": "Daniel Brookman",
  "description": "A theme combining the default light & dark themes to match the current system appearance.",
  "version": "1.0",
  "manifest_version": 2,

  "theme": {
    "colors": {
      "tab_background_text": "rgb(24, 25, 26)",
      "icons": "rgb(24, 25, 26, 0.7)",
      "frame": "#E3E4E6",
      "popup": "#fff",
      "popup_text": "#0c0c0d",
      "popup_border": "#ccc",
      "tab_line": "#0a84ff",
      "toolbar": "#f5f6f7",
      "toolbar_bottom_separator": "#ccc",
      "toolbar_field": "#fff",
      "toolbar_field_text": "rgb(24, 25, 26)",
      "toolbar_field_border": "#ccc"
    }
  },

  "dark_theme": {
    "colors": {
      "tab_background_text": "rgb(249, 249, 250)",
      "icons": "rgb(249, 249, 250, 0.7)",
      "frame": "hsl(240, 5%, 5%)",
      "popup": "#4a4a4f",
      "popup_text": "rgb(249, 249, 250)",
      "popup_border": "#27272b",
      "tab_line": "#0a84ff",
      "toolbar": "hsl(240, 1%, 20%)",
      "toolbar_bottom_separator": "hsl(240, 5%, 5%)",
      "toolbar_field": "rgb(71, 71, 73)",
      "toolbar_field_border": "rgba(249, 249, 250, 0.2)",
      "toolbar_field_separator": "#5F6670",
      "toolbar_field_text": "rgb(249, 249, 250)",
      "ntp_background": "#2A2A2E",
      "ntp_text": "rgb(249, 249, 250)",
      "sidebar": "#38383D",
      "sidebar_text": "rgb(249, 249, 250)",
      "sidebar_border": "rgba(255, 255, 255, 0.1)"
    }
  }
}