Firefox 133 messed up window controls & sideberry collapse

[orelink95]

Describe the bug Since 133 update the close/reduce controls on Windows 11 are unresponsive (can't click them) and if userchrome is turned on for the toolbar to collapse, sideberry expands "under" the webpage you are visiting.

To Reproduce Steps to reproduce the behavior:

1. Activate UserChrome
2. Put your cursor on the collaspe sideberry for it to expand and
3. Try to close / expand / reduce firefox using the top-right buttons

Screenshots Everything looks fine when sideberry is collapsed Problems begin when trying to expand it.

Desktop (please complete the following information):

• OS: Windows 11
• Browser Firefox
• Version 133.0 (64 bits)

[browser-bug]

I can confirm this as well. I add that the search bar gets expanded to full window width covering the whole toolbar.

• OS: Arch Linux x86_64
• DE: Plasma 6.2.4
• Kernel: 6.12.1-arch1-1
• WM: kwin
• Theme: Breeze-Dark [GTK2], Breeze [GTK3]
• Icons: breeze-dark [GTK2/3]
• Browser: Firefox
• Version 133.0 (64 bits)

[sunbart]

+1, same issues

• OS: Windows 10 Pro 22H2