Hi, for the Bookmarks Sidebar, try Ctrl+B -- that should work on most pages, unless they intercept and repurpose it for, say, bolding text.

There's also a Sidebars toolbar button you can add or relocate using Customize:

• Use the Firefox Sidebar to access bookmarks, history, passwords and synced tabs
• Customize Firefox controls, buttons and toolbars

Does one of those methods work?

There also is an optional bookmarks menu button for the toolbar () which you can find in the Customize panel and move to your preferred location.

Does not work. Get bold and large print when doing this. Everything was fine until today when I got updated from Mozilla. Wish I could delete them. May have to stop using Mozilla.

Try opening the new tab page (Ctrl+T) and pressing Ctrl+B there to open the sidebar. Does it work on that page?

Another method is Alt+V to drop the classic View menu, then Sidebar > Bookmarks.

But adding the button to the toolbar would be more convenient in the long run.