Examine source code of Slate Focus Theme

{
  "manifest_version": 2,
  "version": "1.0.0",
  "name": "Slate Focus Theme",
  "description": "A minimal, distraction‑free Firefox theme in professional slate tones. Includes light and dark 5120×200 headers.",
  "theme": {
    "images": {
      "theme_frame": "header_light.png"
    },
    "colors": {
      "frame": "#E6EBF1",
      "tab_background_text": "#111111",
      "toolbar": "#FFFFFF",
      "toolbar_text": "#111111",
      "icons": "#111111",
      "icons_attention": "#111827",
      "button_background_active": "#E5E7EB",
      "button_background_hover": "#F3F4F6"
    },
    "properties": {
      "color_scheme": "light"
    }
  },
  "dark_theme": {
    "images": {
      "theme_frame": "header_dark.png"
    },
    "colors": {
      "frame": "#0F1720",
      "tab_background_text": "#FFFFFF",
      "toolbar": "#0A0C12",
      "toolbar_text": "#FFFFFF",
      "icons": "#FFFFFF",
      "icons_attention": "#93C5FD",
      "button_background_active": "#1F2937",
      "button_background_hover": "#111827"
    },
    "properties": {
      "color_scheme": "dark"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c2131d94-f4dd-4003-b0d8-a3413a60e839}"
    }
  }
}