Examine source code of Modern Steam Theme

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Modern Steam Theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(36, 40, 47)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(23, 29, 37)",
      "tab_background_text": "rgb(143, 143, 144)",
      "toolbar_field": "rgb(29, 32, 38)",
      "toolbar_field_text": "rgb(126, 166, 75)",
      "tab_line": "rgb(32, 32, 32)",
      "popup": "rgb(61, 68, 80)",
      "popup_text": "rgb(220, 222, 223)",
      "button_background_active": "rgb(25, 153, 255)",
      "button_background_hover": "rgb(61, 63, 70)",
      "icons": "rgb(237, 240, 244)",
      "popup_border": "rgb(61, 68, 80)",
      "sidebar_border": "rgb(23, 25, 27)",
      "tab_loading": "rgb(126, 166, 75)",
      "tab_selected": "rgb(62, 64, 71)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(23, 25, 27)",
      "toolbar_field_border_focus": "rgb(126, 166, 75)",
      "toolbar_vertical_separator": "rgb(255, 11, 81)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{61e9fc0f-10e2-420c-87e9-ab5e953aedc5}"
    }
  }
}