Back in December I commented about Firefox’s popup blocker being invoked by the forum. (See Temperature sensing )
I’ve just noticed that a post in a recent thread does the same (See Optical sensor reverse reading )
The common factor in both cases seems to be that Robert has posted a link to another post on the forum in a ‘clever’ format that shows part of the text of the post and allows you to expand it to see the whole post. The problem occurs if you middle-click on the thread title of the link, to open the thread in another tab. Then the link tries to open a popup for some reason and Firefox activates its popup blocker and stops it.
Code that intercepts my mouse clicks and changes them to cause popups is very badly behaved IMHO.