In Firefox, Bookmarks can be found under the Library category from the main menu button or via the Firefox conventional menu, which can be invoked by hitting ALT. Bookmarks is one of the primary entries, and its shortcut is ALT+B.
CTRL+SHIFT+B shows all bookmarks in the Bookmark Manager (which has the dialog title, Library - this is my favorite access method, much like File Explorer)
CTRL+D bookmarks the page you're currently viewing.
CTRL+SHIFT+D bookmarks all open tabs
Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763
A great deal of intelligence can be invested in ignorance when the need for illusion is deep.
~ Saul Bellow, To Jerusalem and Back