Examine source code of Slate active

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Slate",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(163, 163, 163)",
      "toolbar_text": "rgb(15, 23, 42)",
      "frame": "rgb(51, 65, 85)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(51, 65, 85)",
      "toolbar_field_text": "rgb(147, 197, 253)",
      "tab_line": "rgb(229, 231, 235)",
      "popup": "rgb(51, 65, 85)",
      "popup_text": "rgb(226, 232, 240)",
      "tab_loading": "rgb(229, 231, 235)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{97542c1e-b24d-44f1-8da0-1015cb7c73cd}"
    }
  }
}