Examine source code of Cottagecore Mushrooms

{
  "manifest_version": 2,
  "version": "1.0.1",
  "name": "Mushrooms",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(115, 118, 63)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(71, 53, 26, 0.57)",
      "toolbar_field_text": "rgb(237, 207, 107)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "popup": "rgba(126, 54, 33, 0.82)",
      "popup_text": "rgb(237, 207, 107)",
      "icons_attention": "rgb(33, 126, 35)",
      "ntp_background": "rgb(126, 54, 33)",
      "popup_border": "rgb(237, 207, 107)",
      "sidebar_border": "rgb(237, 207, 107)",
      "sidebar_text": "rgb(237, 207, 107)",
      "sidebar": "rgb(126, 54, 33)",
      "tab_selected": "rgba(71, 53, 26, 0.57)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgba(255, 255, 255, 0)",
      "toolbar_field_border": "rgba(255, 255, 255, 0)",
      "toolbar_field_focus": "rgba(71, 53, 26, 0.57)",
      "toolbar_field_highlight": "rgb(33, 126, 35)",
      "toolbar_field_separator": "rgba(255, 255, 255, 0)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)",
      "toolbar_vertical_separator": "rgba(42, 42, 42, 0.57)",
      "tab_loading": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b931fb10-8fec-4fc8-9d06-5fb532a5dfb2}"
    }
  }
}