Examine source code of Reddish

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Reddish",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-013-06591d4ad28ab7b9ee90f62f81d6b505.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(55, 11, 11)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(79, 9, 19)",
      "tab_background_text": "rgb(229, 151, 164)",
      "toolbar_field": "rgb(87, 27, 27)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 5, 45)",
      "popup": "rgb(74, 13, 22)",
      "popup_text": "rgb(248, 249, 252)",
      "button_background_active": "rgb(102, 10, 10)",
      "button_background_hover": "rgb(119, 12, 12)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(52, 7, 13)",
      "popup_border": "rgb(106, 6, 6)",
      "popup_highlight": "rgb(253, 181, 181)",
      "sidebar_border": "rgb(233, 121, 121)",
      "sidebar_highlight_text": "rgb(249, 245, 245)",
      "sidebar_highlight": "rgb(135, 13, 13)",
      "sidebar": "rgb(60, 12, 12)",
      "tab_selected": "rgb(78, 17, 25)",
      "tab_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 5, 45)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{877d4612-fb7f-4405-a122-13ee24e94acf}"
    }
  }
}