Examine source code of MacOS Dark Theme

{
  "manifest_version": 2,
  "name": "macOS Dark Theme",
  "version": "1.0.0",
  "description": "A macOS-style dark theme for Firefox browser",
  "theme": {
    "colors": {
      "frame": "#282828",
      "frame_inactive": "#232323",
      "tab_background_text": "#999999",
      "tab_text": "#ffffff",
      "tab_line": "#007AFF",
      "tab_loading": "#007AFF",
      "toolbar": "#323232",
      "toolbar_text": "#ffffff",
      "toolbar_field": "#464646",
      "toolbar_field_text": "#ffffff",
      "toolbar_field_border": "#606060",
      "toolbar_field_focus": "#464646",
      "toolbar_top_separator": "#606060",
      "toolbar_bottom_separator": "#606060",
      "toolbar_vertical_separator": "#606060",
      "ntp_background": "#1e1e1e",
      "ntp_text": "#ffffff",
      "sidebar": "#323232",
      "sidebar_text": "#ffffff",
      "sidebar_border": "#606060",
      "popup": "#323232",
      "popup_text": "#ffffff",
      "popup_border": "#606060",
      "popup_highlight": "#464646",
      "popup_highlight_text": "#ffffff",
      "button_background_hover": "#464646",
      "button_background_active": "#606060",
      "icons": "#ffffff",
      "icons_attention": "#007AFF"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b399dc00-1925-4568-89d2-7116462db55b}"
    }
  }
}