Tabs on bottom not working Firefox 133.0

[Waytoogo]

Describe the bug

when I set
user_pref("userChrome.tabbar.on_bottom", true);
nothing happens. I have reverted to Firefox 132.0.2 until this is fixed.

Expected behavior

I want it to work like it did in older versions of Firefox.

Screenshots

No response

OS

Windows 11

OS - Others

No response

Firefox Version

133.0

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

user_pref("userChrome.tabbar.on_bottom",                    true);
user_pref("userChrome.tabbar.on_bottom.menubar_on_top",     true);

Additional context

No response