Examine source code of Cool Slate Edge

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Cool Slate Edge",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(68, 84, 105)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(42, 52, 65)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(54, 67, 84)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(37, 45, 57)",
      "popup": "rgb(74, 74, 74)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(93, 107, 125)",
      "button_background_hover": "rgb(83, 97, 117)",
      "frame_inactive": "rgb(42, 52, 65)",
      "icons_attention": "rgb(138, 180, 248)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(36, 36, 36)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(47, 58, 73)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgb(87, 87, 87)",
      "sidebar_border": "rgb(111, 123, 139)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(72, 72, 72)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(59, 59, 59)",
      "tab_loading": "rgb(138, 180, 248)",
      "tab_selected": "rgb(68, 84, 105)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(111, 123, 139)",
      "toolbar_field_border_focus": "rgb(99, 173, 229)",
      "toolbar_field_border": "rgb(54, 67, 84)",
      "toolbar_field_focus": "rgb(43, 43, 43)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(147, 184, 231)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(34, 43, 53)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{80e3bfce-c82a-416f-8202-393bcc13a681}"
    }
  }
}