Splitters
This is a working draft Report issue
Splitters are used to separate the contents of developer tools into several resizable panes.
Usage
Some split panes in developer tools can be activated using the sidebar toggle button or by turning on the split Console.
Future Work
In vertical mode, horizontal splitters will be 2px wide and have a hover effect to differentiate them from other horizontal lines. This is currently available in Nightly (bug).