Examine source code of Undertale Ruins

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Undertale Ruins",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(133, 86, 180, 0.52)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(128, 10, 158)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(79, 122, 163, 0.33)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(109, 0, 184)",
      "popup": "rgb(147, 101, 169)",
      "popup_text": "rgb(202, 202, 255)",
      "button_background_active": "rgba(255, 0, 255, 0.66)",
      "button_background_hover": "rgba(251, 176, 251, 0.66)",
      "frame_inactive": "rgb(212, 0, 212)",
      "icons_attention": "rgb(249, 255, 51)",
      "icons": "rgb(254, 244, 255)",
      "ntp_background": "rgb(114, 75, 142)",
      "popup_highlight": "rgb(176, 251, 192)",
      "tab_selected": "rgba(181, 119, 181, 0.81)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgb(255, 227, 255)",
      "toolbar_field_border": "rgb(255, 255, 255)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(237, 64, 237)",
      "toolbar_vertical_separator": "rgb(195, 9, 195)",
      "tab_loading": "rgb(109, 0, 184)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{019df84e-16cf-4d7e-a606-86b3aa88aa6f}"
    }
  }
}