In current Nightly, with my normal browsing profile, New Tab Page *insists* on having 3 rows of tiles. If my browser isn't quite tall enough to show 3 rows, then it just has the 3rd row overflow and creates a scrollbar. This didn't used to be the case -- we used to simply remove rows that didn't fit. Maxim describes the reason for the current (new) behavior in bug 1194895 comment 55. I'm filing this bug on adding a pref that lets users (like me) request the old behavior -- to tell New Tab that it's welcome to discard the 2nd or 3rd rows if they don't fit. (even if they have a history tile -- IIUC, that's currently the thing that makes those rows stick around)
Summary: Add a pref to prevent tiles from creating a vertical-scrollbar on new tab page → Add a pref to allow rows of tiles to be hidden if they don't fit (even if they contain history tiles), to avoid creating scrollbar on new tab page
You need to log in before you can comment on or make changes to this bug.