Firefox Mac menu bar covers tabs when in full screen

In Firefox for Mac, when in fullscreen mode, moving the mouse curser to the top of the screen to show the menu bar covers the open tabs, address bar etc. I'm not sure if this is a feature or a bug - in other browsers the tabs move down so that you can still click on them, which I much prefer. Is there a way to have Firefox move the address bar etc out of the way when showing the menu bar in full screen? I've attached a couple of screenshots to show the behaviour in Firefox compared to Brave browser (and I guess Chrome). Apologies if this has been answered elsewhere, I saw a few similar posts but nothing with this exact issue. Thanks!