Menu automatically hides always in 8.9.1 in Firefox
After an upgrade to the version 8.9.1-ee.1, the menu bar on the left is always in auto-hide mode in Firefox. Chrome is not affected
Chrome: the "pin" button is present on the menu
Firefox 47.0, Windows 7 64 bit, screen size 2560×1440: the pin button is not shown, menu is in auto-hide mode always.
(This issue title and body has been changed when I discovered the browser difference)