Tab bar broken in fullscreen

[elleybean]

Describe the bug

Beginning for me in Firefox v133, the tool bar expands and shoves the title bar off the top of the screen in fullscreen windows on the latest stable macOS.

This occurs when a new window is put into fullscreen mode. If already in a fullscreen window and opening a new fullscreen window, it behaves as expected until switching virtual desktops.

Expected behavior

Top bar appears only as in the first screenshot and never as in the second screenshot.

Screenshots

OS

Mac OS

OS - Others

No response

Firefox Version

v133

Distribution

• Original Lepton
• Lepton's photon style
• Lepton's proton style

Theme

• Light
• Dark
• Alpenglow (System: Light)
• Alpenglow (System: Dark)
• System Default
• Others: (e.g. Photon Colors, Google Chrome Dark, Fairytale Of Nature)

Theme - More Info

No response

user.js setup

user.js setup

// Your settings

Additional context

No response

[ajchow66]

Confirming this issue is also appears for the proton style.

It looks like only checking the option to hide toolbars in fullscreen avoids this problem, since the tab bar shows up normally with this option.

[rockenren]

Confirming on macOS 14.7.2.

[axelberardino]

Got the same issue.

You can temporarily fix this issue by adding that at the end of the leptonChrome.css css:

toolbar {
  min-width: 1px;
  min-height: 32px;
}