ResourceWarning: unclosed file <_io.BufferedRandom name='path/to/tmp_mxwkwqh.sqlite'>

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Consider the following script:

# script.py
import browser_cookie3
browser_cookie3.firefox()

Run it with with -Wa flag so resource warnings are shown. (python -Wa 'path/to/script.py')
The following warning is shown:

$ python -Wa 'script.py'
C:\Users\a\AppData\Local\Programs\Python\Python311\Lib\site-packages\browser_cookie3\__init__.py:373: ResourceWarning: unclosed file <_io.BufferedRandom name='C:\\Users\\a\\AppData\\Local\\Temp\\
tmp3g0or7p1.sqlite'>
  suffix='.sqlite').name
ResourceWarning: Enable tracemalloc to get the object allocation traceback

The result after enabling tracemalloc:

$ python -Wa -X tracemalloc 'script.py'
C:\Users\a\AppData\Local\Programs\Python\Python311\Lib\site-packages\browser_cookie3\__init__.py:373: ResourceWarning: unclosed file <_io.BufferedRandom name='C:\\Users\\a\\AppData\\Local\\Temp\\
tmp1tq62xnu.sqlite'>
  suffix='.sqlite').name
Object allocated at (most recent call last):
  File "C:\Users\a\AppData\Local\Programs\Python\Python311\Lib\tempfile.py", lineno 563
    file = _io.open(dir, mode, buffering=buffering,