It's not pop-ups but Tooltip when move mouse over a Thread.
Tooltip Wrote:Tooltip is a concept used in HTML for showing some extra information about the specifically selected element.
This can be done on the mouse hover effect whenever the user moves the mouse
over an element that is using a tooltip to display specified information about that element.
If scroll with mouse and not hold over any Threads then do no get Tooltip info.
So should only have mouse over if want more info without clicking on Thread.
Tootip is part of the Theme design,not heard of anyone else complain about this.
It possible to turn off,but it's a help if use it Tooltip correct,so will wait and see what other say.