Examine source code of Slate

{
  "manifest_version": 2,
  "name": "Edge Slate Theme",
  "version": "1.0.2",
  "description": "Microsoft Edge browser Slate theme",
  "theme": {
    "colors": {
      "toolbar": "#516785",
      "toolbar_text": "#e4e4dc",
      "toolbar_field": "#3C506F",
      "toolbar_field_text": "#e4e4dc",
      "toolbar_bottom_separator": "#516785",
      "frame": "#2a3442",
      "tab_selected": "#516785",
      "tab_background_text": "#CCCCC5",
      "tab_line": "#DDDFE2",
      "popup": "#516785",
      "popup_text": "#e4e4dc",
      "tab_loading": "rgb(255, 255, 225)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6ca11a77-6956-4fcb-97f8-b4dab76ce50c}"
    }
  }
}