Error in Field Configuration button on task node inside a tourist app tree in Firefox (Windows)

[RicardCots]

Describe the bug
When trying to configure the Output Mapping in the Field Configuration subform (in an Tourist app tree) of a task node, the screen starts blinking continuously, making it impossible to interact with the form or configure the fields.

To Reproduce
Steps to reproduce the behavior:

1. Create a new Task node.
2. Click on Field configuration.
3. Open the Output Mapping tab.
4. Observe that the screen starts blinking and the form becomes unusable.

Expected behavior

The Output Mapping form should remain stable and usable so the user can configure the fields without the interface blinking.

Screenshots

Additional context
Add any other context about the problem here.

[RicardCots]

I've tried again this morning in different contexts.

This behaviour only occurs in Firefox. The problem does not occur in Chrome or Edge, where the form works normally.

Browser: Firefox 148.0.2 (64-bit)
Operating System: Windows 10 Pro
Graphics: NVIDIA GeForce GTX 745 (2 GB)
Display setup: Dual monitor

1280 × 1024
1680 × 1050

[fjlopez]

Did you also test the fix?

[fjlopez]

Cannot reproduce the issue with the same version of Firefox in my setup. Tested version 1.2.5 and patch.

Browser: 148.0.2 (aarch64)
Operating System: Tahoe 26.3.1
Hardware: Mac Book Pro M1
Display setup: Built-in display