[Bug]: Intermittent failure in "should check that dragging is disabled when pasting" on Windows/Firefox

[Snuffleupagus]

Attach (recommended) or Link to PDF file

N/A

Web browser and its version

Firefox

Operating system and its version

Windows

PDF.js version

master

Is the bug present in the latest PDF.js version?

Yes

Is a browser extension

No

Steps to reproduce the problem

1. Check https://github.com/mozilla/pdf.js/actions/runs/27938064781/job/82664482228
2. Notice that the test failed:

Run 511 tests
OHNOES!  Some integration tests failed!
  1 of 511 failed
Here are the failing tests:
  - in firefox | should check that dragging is disabled when pasting | Error: Waiting for selector `#thumbnailsView.isDragging` failed
integration tests runtime was 1256.2 seconds
[08:20:56] 'runIntegrationTest' errored after 21 min
[08:20:56] Error: Running integration tests failed.

What is the expected behavior?

That this integration-test passes on all platform/browser combinations.

What went wrong?

The integration-test fails intermittently, with a high frequency, on Windows/Firefox.

Link to a viewer

No response

Additional context

Note: This has been happening for a while now, possibly a couple of weeks.