Examine source code of Spider-Man Easy

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Spider-Man Easy",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(48, 48, 138)",
      "toolbar_text": "rgb(231, 40, 40)",
      "frame": "rgb(115, 44, 43)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(99, 50, 50)",
      "toolbar_field_text": "rgb(184, 184, 246)",
      "tab_line": "rgb(0, 46, 255)",
      "popup": "rgb(122, 40, 37)",
      "popup_text": "rgb(214, 221, 254)",
      "button_background_active": "rgb(121, 28, 28)",
      "button_background_hover": "rgb(76, 108, 179)",
      "icons_attention": "rgb(0, 37, 255)",
      "icons": "rgb(223, 75, 75)",
      "ntp_background": "rgb(102, 36, 36)",
      "ntp_text": "rgb(22, 34, 175)",
      "popup_border": "rgb(0, 38, 255)",
      "popup_highlight_text": "rgb(144, 150, 210)",
      "popup_highlight": "rgb(239, 173, 173)",
      "sidebar_border": "rgb(255, 0, 0)",
      "sidebar_highlight_text": "rgb(11, 0, 255)",
      "sidebar_highlight": "rgb(11, 0, 255)",
      "sidebar_text": "rgb(255, 192, 192)",
      "sidebar": "rgb(128, 39, 39)",
      "tab_background_separator": "rgb(0, 38, 255)",
      "tab_loading": "rgb(0, 0, 255)",
      "tab_selected": "rgb(54, 67, 111)",
      "tab_text": "rgb(249, 121, 121)",
      "toolbar_bottom_separator": "rgb(255, 108, 111)",
      "toolbar_field_border_focus": "rgb(255, 0, 0)",
      "toolbar_field_border": "rgb(186, 60, 62)",
      "toolbar_field_focus": "rgb(43, 47, 106)",
      "toolbar_field_highlight_text": "rgb(254, 168, 168)",
      "toolbar_field_highlight": "rgb(147, 43, 43)",
      "toolbar_field_separator": "rgb(255, 0, 4)",
      "toolbar_field_text_focus": "rgb(255, 228, 228)",
      "toolbar_top_separator": "rgb(125, 116, 255)",
      "toolbar_vertical_separator": "rgb(190, 0, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8a65162c-0e23-440e-a9f0-351d1d01b00b}"
    }
  }
}