>>I see the behaviour Lutz is describing in 32.0.2
>
>There seems to be a problem with Firefox when going back. The representation should always be as shown in the image I attached in the previous message.

Just wanted to give you more data points. And the clock should not be important in this behaviour, as it only happens going back, as I also green when loading in a new window AND when viewing the same message "via open link in new tab"