A .jfif file is essentially a renamed .jpg. It contains the exact same data and compression as a standard JPEG, but the extension looks different. How to Open JFIF Files

Certain Windows Creators Updates and browser updates in Chrome or Edge can default to saving JPEG images as .jfif .

Windows Photos, macOS Preview, and web browsers (Chrome/Edge) can open JFIF files directly.

You can right-click the file, select "Rename," and change the extension from .jfif to .jpg . How to Convert JFIF to JPG

If you want to stop this from happening, you can modify your Windows registry: JFIF to JPG Converter - CloudConvert