In the past day or two, some - but not all - images have not been shown in Firefox. Just the word "image" appears.
For example, the stone idol image at the bottom of viewtopic.php?f=22&t=18189&view=unread#unread
I've found that on my Windows 7 machine, I can't see it in either normal or private browser windows.
Opera and Chrome show it in both kinds of windows.
On a Windows 10 pc, it's ok in normal windows but not private ones.
Not much of a problem now that I know how to get round it - I'm just reporting it to save head-scratching if anybody else has this "feature".