Right Click Save Image As Not Using Correct Image Extension

[D.Dancer]

I have a PNG image in the browser, I right click and select Save As, browser says "filename.png.jpg"

Serious?

[Brummelchen]

open image in a hex-editor and you probably will see that it is jpg formatted.
https://mh-nexus.de/en/hxd/

[Reflective]

Right click the image and click "View Image Info".

[RobertJ]

.
Brummelchen is likely correct.

You can test by going to Test inline PNG images and right clicking on the image and selecting Save As, the image will be saved as nurbcup2si.png


.

[D.Dancer]

Brain fart, I must be getting old, ...