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When I try to save an image, the browser doesn't automatically recognize the extension, asking to "save as..all files".How can I solve?Until yesterday it worked

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When I try to save an image, the browser doesn't automatically recognize the extension, asking to "save as..all files".How can I solve?Until yesterday it worked.

If i go to "about: preferences -> look for content or application type" I can not find any image files.

When I try to save an image, the browser doesn't automatically recognize the extension, asking to "save as..all files".How can I solve?Until yesterday it worked. If i go to "about: preferences -> look for content or application type" I can not find any image files.
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When I look at your screenshot, I don't recognize the extension either... Could you change your Windows settings to show all file extensions, including common ones like.jpg and .png? See: https://www.bleepingcomputer.com/tutorials/how-to-show-file-extensions-in-windows/

If a site is not sending an image content type, Firefox won't know how to handle the file. This varies from site to site...

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in this way, as you said, it works again! thanks.

but.. until few hours, it worked although no visible extension.

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Sorry, I can't explain it. I have set Windows to show all file extensions for the past 20 years, so I don't know what is supposed to happen when it's not set that way.

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for today I'm ok with visible extensions. Thanks :)