Hi, which platform has this problem? By that I mean: Windows, Mac, Linux, Android, or iOS

If you can't see any toolbars on Windows, Mac, or Linux, your Firefox might be in full screen. For tips on entering and exiting full screen, see: Use Firefox in Full Screen mode

If you have the address bar but you are missing your Bookmarks Toolbar, see: Bookmarks Toolbar - Display your favorite websites at the top of the Firefox window

Firefox has become an annoyance. NOT HELPFUL

Assuming you are on Windows, you can try installing Firefox from the Microsoft Store.