2004915 - Firefox crashes/gets unresponsive when enabling Title Bar from Customize page on Ubuntu

Status: NEW

(Firefox :: Toolbars and Customization, defect)

Description

[Mihai Boldan, Desktop QA [:mboldan]]

Found in

• Firefox 147.0b1

Affected versions

• Firefox 147.0b1
• Firefox 148.0a1

Tested platforms

• Affected platforms: Ubuntu 22, Ubuntu 24
• Unaffected platforms: macOS 10.15, Windows 10x64, Windows 11x64

Steps to reproduce

1. Open the application menu (hamburger menu) -> select "More Tools" -> "Customize Toolbar...".
2. From the bottom of the page activate the "Title Bar".

Expected result

• Title Bar is enabled.

Actual result

• Firefox windows disappears and gets unresponsive. See the attached video.

Regression range

• Will search for a regression asap.

Additional notes

• Note that the issue is not reproducible on Firefox 146 RC.
• Note that the issue was reproducible only with Window Protocol - 'wayland'.
• Note that on one try, the FF behavior closed all other opened apps. This was reproduced only once.