Left-click or <Enter> - activate element.
Right-click or <Right> - check (to delete or merge).
<Delete> - delete element.
Long press or <Ctrl>Enter - alternative activation (open uri)
<Ctrl>S - upload item (texts to fpaste, images to imgur)
<Ctrl>D - pin element
<Ctrl><Shift>A - check/uncheck all
<Up>/<Down> - select.
<Ctrl>+1-9 - activate one of the first nine visible.
<Super>z - clipboard contents preview.
<Super><Shift>Q - show pinned items.
<Ctrl><Tab> - switch to next history (<Escape> to close switcher).
<Ctrl><Shift><Tab> - switch to prev history.
<Super>Q - show.
<Escape> - cancel.
While holding <Super>:
Press 1-9 - activate one of the first nine visible.
Q or <Down> - select next.
W or <Up> - select previous.
Release <Super> or press <Enter> to activate selected item.
if there is more than one checked items, checked items will be merged.
"-f" to search only files
"-t" - text
"-l" - links
"-c" - show only checked items