Examine source code of Renna (Elden Ring theme)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Renna (Elden Ring theme)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.25)",
      "toolbar_text": "rgb(177, 202, 222)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(177, 202, 222)",
      "toolbar_field": "rgba(0, 0, 0, 0.15)",
      "toolbar_field_text": "rgb(177, 202, 222)",
      "tab_line": "rgb(54, 110, 146)",
      "popup": "rgb(227, 245, 255)",
      "popup_text": "rgb(54, 110, 146)",
      "button_background_hover": "rgba(54, 110, 146, 0.6)",
      "tab_selected": "rgba(54, 110, 146, 0.4)",
      "toolbar_bottom_separator": "rgba(54, 110, 146, 0.8)",
      "toolbar_field_border": "rgba(54, 110, 146, 0.8)",
      "toolbar_top_separator": "rgba(54, 110, 146, 0.8)",
      "toolbar_vertical_separator": "rgba(54, 110, 146, 0.6)",
      "tab_loading": "rgb(54, 110, 146)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2bacb8fb-c36c-4564-b0c5-2d0f248973d8}"
    }
  }
}