[Python] Python Great Tables does not save to PDF, but always to PNG

from great_tables import GT
from great_tables.data import sp500

# Selenium 4, Firefox
from selenium import webdriver
from selenium.webdriver.firefox.service import Service as FirefoxService
from webdriver_manager.firefox import GeckoDriverManager
options = webdriver.FirefoxOptions()
options.add_argument("--headless")
driver = webdriver.Firefox(service=FirefoxService(GeckoDriverManager().install()), options=options)

# Define the start and end dates for the data range
start_date = "2010-06-07"
end_date = "2010-06-14"

# Filter sp500 using Pandas to dates between `start_date` and `end_date`
sp500_mini = sp500[(sp500["date"] >= start_date) & (sp500["date"] <= end_date)]

# Create a gt table based on the `sp500_mini` table data
(
GT(sp500_mini)
.tab_header(title="S&P 500", subtitle=f"{start_date} to {end_date}")
.fmt_currency(columns=["open", "high", "low", "close"])
.fmt_date(columns="date", date_style="wd_m_day_year")
.fmt_number(columns="volume", compact=True)
.cols_hide(columns="adj_close")
).save(
file="test.pdf",
web_driver=driver,
window_size=(6000, 6000)
)


In the above code the output file is saved as "test.png". This image file works fine, but it's not a pdf. When using the following in the save-method (and without the selenium block):

webdriver = "firefox"


The following error occurs:

InvalidArgumentException: Message: binary is not a Firefox executable


How do I save a great table to pdf?

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