Examine source code of Microsoft Edge

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "edge",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(59, 59, 59)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(32, 32, 32)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(41, 41, 41)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(59, 59, 59)",
      "popup": "rgb(59, 59, 59)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(74, 74, 74)",
      "button_background_hover": "rgb(74, 74, 74)",
      "ntp_background": "rgb(36, 36, 36)",
      "popup_border": "rgb(59, 59, 59)",
      "tab_loading": "rgb(32, 32, 32)",
      "tab_selected": "rgb(59, 59, 59)",
      "toolbar_bottom_separator": "rgb(59, 59, 59)",
      "toolbar_field_border_focus": "rgb(77, 141, 250)",
      "toolbar_field_focus": "rgb(44, 44, 44)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(147, 184, 231)",
      "toolbar_top_separator": "rgb(59, 59, 59)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ccd4b71c-d7b3-46f9-8bed-e8dc10e19b35}"
    }
  }
}