Trying to hide list of recent bookmarks? I _may_ be able to help.
/*Hide recent books [nuclear option, have gone insane, do not use]*/
#panelMenu_recentBookmarks,
#PanelUI-bookmarks > .panel-subview-body {
display: none !important;
}
/*Hide recent books [nuclear option, have gone insane, do not use]*/
#panelMenu_recentBookmarks,
#PanelUI-bookmarks > .panel-subview-body {
display: none !important;
}