Firefox not displaying responsive image in content page

I looked at your site. The image also does not resize in IE 10. I also can't see the reason for it. But when I give it a position: absolute; it does resize. Perhaps you can do something with that?

Because some browser display your site correct and others don't, I guess your CSS styling is OK. When I have this kind of problem I just start to seek what styling declaration causes the problem. It is a frustrating puzzle, but I see no other way.

You can try to start with a fresh Zen subtheme and start again with implementing your styling around the content area and see what happens.

Try to have fun, puzzling vitalizes the mind :-)

Did someone found a solution to this problem?
It is happen to me also - Working fine in chrome, but not working in Firefox & IE.

Actually, I just notice that, that for a half of a second the picture is on the right size, but then jumping to the bigger, not responsive size.

I am curious if this is still an issue with Zen 7.x-5.4
since it has been substantially updated
from the train-wreck that 5.3 was... ?

Please respond, so that, if it is not a problem w/ 5.4,
this issue can be closed with the status: "Closed (Won't Fix)"

Thank you for you time, attention, and help.

Calling free software a train wreck is petty.

.
I do apologize. It will not happen again.

My only intent was humor.

===

PS: JaW: Welcome back to Zen after your extended trip
to upper-management at Drupal 8.

I know of (roughly), and appreciate,
the work you are doing there in the Theming department.

: o )

The linked site is not available. Closing.