By any chance do you have the classic menu bar displayed? When you display the full width menu bar with its own Bookmarks menu, then the bookmarks icon on the toolbar automatically hides. When you use the compact menu (orange Firefox button) then the bookmarks icon unhides.

Or possibly the icon moved to a different bar. You can use the Customize feature to look around for it. You can use either of these to get started:

• right-click a blank area of the tab bar > Customize
• tap the Alt key > View menu > Toolbars > Customize

Note that there are two different bookmarks icons available. If you are looking at them in the Customize dialog, the word Bookmarks appears twice for the one that displays the drop-down list.

Sure did have the "classic" menu bar showing ... don't know how, but it's gone now! Thanks!