Which Windows version do you use?

You probably have to hide the menu bar (Vaade > Toolbars; Estonian equivalent) to make Firefox show the orange Firefox menu button and draw that button and the tab bar in the Windows title bar.

• https://support.mozilla.org/kb/how-do-i-get-firefox-button

I'm experiencing exactly the same issue. blue solid border around firefox window, but no menu I have the orange button in it. (other non Firefox windows have a see trough border)

additional info;

I noticed this when I had my laptop and desktop next to each other I'm using Windows 7 on both, on the Laptop I'm using Windows 7 Pro 64bit (this one is OK)

on the Desktop I'm using Windows 7 Ultimate 32bit (with blue border)

both machines have an Nvidia graphics card, Aero is switched on and visual effects on automatic. Hiding or unhiding the menubar doesn't help

Hope you can help me ?

Thanks ! Ton

Maximize the Firefox window and the Titlebar will become hidden, allowing the Persona to go to the top of the window.