719/16/1719162851835s.jpg
and also opens fine in Chrome and Firefox.
The title of the image (but not the file you save) is fe.jfif.jpg so it seems the system figured out it was a jpg with a funky suffix.
Running "file" gives this:
1719162851835.jpg: JPEG image data, JFIF standard 1.01, aspect ratio, density 72x72, segment length 16, baseline, precision 8, 1361x2048, frames 3