Some projects made on Chrome don't work on Firefox (and vice versa)

[TailfeatherStudios]

Expected Behaviour

The pipes in this video should be spaced far enough apart for me to "flap" through them.

Actual Behaviour

The pipes are not spaced far enough apart, leading to a situation where I am forced to lose.

Steps to Reproduce

Visit the project page (https://scratch.mit.edu/projects/1025919551/) on Firefox.

System Details

Windows NT 10.0 (actually Windows 11, not sure why it's saying 10 here), Firefox 130.0

Screenshots
Videos would be more effective at showcasing this discrepancy, so I've included them instead.

Showcasing the aforementioned project:
https://scratch.mit.edu/discuss/youtube/v6w9dEtLkLw

Showcasing speed differences:
https://scratch.mit.edu/discuss/youtube/DMA8cBt64es/

Relates to issue #3715