Examine source code of Zenitsu, Demon Slayer

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Zenitsu, Demon Slayer",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 238, 217, 0.44)",
      "toolbar_text": "rgb(98, 49, 0)",
      "frame": "rgb(255, 218, 184)",
      "tab_background_text": "rgb(97, 46, 0)",
      "toolbar_field": "rgba(255, 226, 202, 0.29)",
      "toolbar_field_text": "rgb(68, 38, 0)",
      "tab_line": "rgba(255, 148, 0, 0.57)",
      "popup": "rgb(255, 239, 220)",
      "popup_text": "rgb(47, 35, 19)",
      "button_background_active": "rgb(255, 128, 47)",
      "button_background_hover": "rgba(255, 173, 83, 0.71)",
      "icons": "rgb(83, 41, 0)",
      "ntp_background": "rgba(255, 235, 216, 0.17)",
      "ntp_text": "rgb(68, 30, 0)",
      "popup_border": "rgba(255, 128, 0, 0.45)",
      "popup_highlight_text": "rgb(0, 0, 0)",
      "popup_highlight": "rgb(255, 184, 132)",
      "sidebar_border": "rgb(255, 255, 255)",
      "sidebar_highlight_text": "rgb(83, 0, 0)",
      "sidebar_text": "rgb(33, 0, 0)",
      "tab_loading": "rgba(255, 155, 0, 0.18)",
      "tab_selected": "rgba(253, 159, 76, 0.85)",
      "tab_text": "rgb(255, 248, 239)",
      "toolbar_bottom_separator": "rgb(255, 232, 219)",
      "toolbar_field_border_focus": "rgb(255, 242, 225)",
      "toolbar_field_border": "rgb(255, 241, 222)",
      "toolbar_field_focus": "rgba(255, 215, 187, 0.49)",
      "toolbar_field_highlight_text": "rgb(51, 32, 0)",
      "toolbar_field_highlight": "rgba(255, 107, 0, 0.42)",
      "toolbar_top_separator": "rgb(255, 236, 210)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0a71a7a7-3528-4c0a-af74-64eb0ac67b6d}"
    }
  }
}