EDIT: The answer is below.
For several days I tried to understand why Mozilla Firefox does not constantly extract images from its cache, but does not extract new copies every time I reload the page.
Google Chrome did not seem to have this problem, but this is because updating a page in Chrome does NOT force images to reload (unless CTRL-F5 is used).
Below I answered my question and added additional information, which I hope will save someone else some time to solve this problem.
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