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+
+https://support.mozilla.org/en-US/kb/tabs-organize-websites-single-window#w_tab-tips
+
+> To bookmark a set of tabs all at once use the keyboard shortcut Ctrl + Shift + D. 
+
+This one appears to be a documentation bug, since by all accounts the option
+is deliberately gone from the top-tier menus, having been relegated to the
+tabs contextual menu.
+