When saving an image, why does Firefox download it again, although it is already downloaded and displayed?

If you right click an image on a website and choose "save image", it will be downloaded again. It is already in the browser cache though. There are addons which let you pick it from the cache.
Why doesn't Firefox just save the cached image and instead downloads it again? There seems to be no obvious rationale to do it like that (and lots to use the cached version).

Thanks you, but that's not an answer to my question.
I'm not looking for workarounds. I would like to know (preferably from someone at Mozilla) why the browser works this way and if they are going to change it.

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