StickyHeaders 3.0 for SharePoint 2013 on-premises and SharePoint Online has been released.
I spent a lot of time to get rid of the bugs in previous versions and I came up with greatly simplified code that makes a lot of things better than before. One of the biggest changes is that the sticky headers now keep their full functionality in quick edit mode.
Furthermore, the performance has been dramatically increased and all calculations which are necessary to figure out whether the header shall be sticky or not take now less than 1ms for each scroll step on a normally powered computer (especially important when smooth scrolling is activated). You can grab the script directly from the related Product Page