Why is this happening in Firefox?

[Feek]

It's not just this forum, it's other places as well.

If I clear my cache and refresh, it goes back to normal but then when I refresh again, it appears as above.

It's effectively showing alt-text instead of images, but only in some places.

I've done all the usual OS X stuff like blatting caches, running maintenance scripts etc.

Any ideas?

 

[electric ant]

What add-ons are you running, could try disabling a few and seeing if that helps?

 

[Zebede]

Give this a try, just in case.

Enter "about:config".
Type "image" in the filter box
Make sure the "browser.display.show_image_placeholder" option is set to "true".