Examine source code of CAT PICS

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "CAT PICS",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png",
        "images/2.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center",
        "center center",
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "repeat-y",
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(29, 7, 45)",
      "toolbar_text": "rgb(134, 16, 220)",
      "frame": "rgb(33, 8, 51)",
      "tab_background_text": "rgb(98, 102, 183)",
      "toolbar_field": "rgb(29, 7, 45)",
      "toolbar_field_text": "rgb(123, 127, 204)",
      "tab_line": "rgb(9, 9, 9)",
      "popup": "rgb(3, 34, 32)",
      "popup_text": "rgb(98, 102, 183)",
      "button_background_active": "rgb(9, 244, 234)",
      "button_background_hover": "rgb(82, 61, 98)",
      "frame_inactive": "rgb(9, 244, 234)",
      "icons_attention": "rgb(111, 142, 140)",
      "icons": "rgb(89, 200, 192)",
      "ntp_background": "rgb(134, 16, 220)",
      "ntp_text": "rgb(18, 123, 237)",
      "popup_border": "rgb(248, 1, 51)",
      "popup_highlight_text": "rgb(237, 18, 63)",
      "popup_highlight": "rgb(16, 220, 206)",
      "sidebar_border": "rgb(248, 1, 51)",
      "sidebar_highlight_text": "rgb(40, 6, 64)",
      "sidebar_highlight": "rgb(111, 142, 140)",
      "sidebar_text": "rgb(134, 16, 220)",
      "tab_loading": "rgb(9, 9, 9)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1b3de96-2eb4-406a-ac09-8b3d10bcafbb}"
    }
  }
}