The keyboard shortcuts documentation on bookmarks states that for Mac "command + shift + B" should Show All Bookmarks, however that does not work for me - I always need to manually click into the Bookmarks menu and then click Show All Bookmarks. https://support.mozilla.org/en-US/kb/keyboard-shortcuts-perform-firefox-tasks-quickly#w_bookmarks If someone has a suggestion for how to debug this type of issue that would be great. I didn't see any likely culprits that could cause a conflict here. https://defkey.com/what-means/command-shift-b