I then use the "View next topic" button to read the other messages, and, eventually I will have read all the messages newer than my first selection.
"View next topic" will now give me a screen with the (completely accurate) information message "There are no newer topics in this forum". This screen also shows a link to "MozillaZine Forum Index" but shows no way to go back to the forum that I was reading (which still has unread topics).
I think that, in this situation, the same possibilities should be available as when "Mark all topics read" is selected in a forum. That is
- the forum should be redisplayed after a number of seconds, and/or,
- a link should be shown to enable the user to return to the forum.
(I do realise that I could press the Back key but I'm looking for consistency)