The sidebar currently let's you select if you want to see Windows, Tabs, Bookmarks or Reading List. It's doing that with checkmarks. Checkmarks are usually used for multi-select. Single select is done using radio buttons.
Anyway, since we are using checkmarks, i would like to be able to check multiple categories for the sidebar so i can see Bookmarks AND/OR Tabs AND/OR WindowsAND/OR Reading list. Ideally i would like to have History as well (default unselected).
This will make my sidebar the go-to area for amything i have done in this browser session.