The lack of buttons
I don't have any buttons when the title bar is disabled. Firefox (77.0.1) 64-bit. I tried reinstalling the browser. Not help
Wubrane rozrisanje
The screenshot you posted shows a Firefox menu bar that is embedded in a Linux status bar, so it is likely that this integration is causing the caption buttons to be hidden.
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What buttons are you talking about?
Close, collapse and expand buttons
Start Firefox in Safe Mode {web link}
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?
That is possibly an issue with the Ubuntu Unity desktop manager.
I have Linux mint 19 installed with the desktop environment of Mate. The window manager is Marco. Starting in safe mode did not solve the problem.
Wubrane rozrisanje
The screenshot you posted shows a Firefox menu bar that is embedded in a Linux status bar, so it is likely that this integration is causing the caption buttons to be hidden.
Thank you so much!