When I open with a recent Firefox the search popup on the index page, I get a scrollbar because the height is few pixels to short:
This is not the case for the view of any topic:
This seems to be a bug! 
Kind regards!
AI-generated summary
Users are discussing an ugly scrollbar issue in the search popup on the index page. rriemann first reported the issue with a recent version of Firefox, providing screenshots. However, others, including cpradio and TechnoBear, were unable to reproduce the issue. Mittineague was able to reproduce the issue and suspects that there may be a problem with the browser determining the available space.
Weird… I can’t recreate this on my sandbox, using latest Firefox (v43.0.4)
I can’t access Meta using Firefox at work, so I can’t fully test that, but it definitely isn’t a bug, more of a UX annoyance.
I can’t reproduce it here using Firefox 44 on Ubuntu Gnome 15.10.
