So so sorry to hear!! Can you please file a bug report on GitHub @ https://github.com/arimgibson/deadname-remover or shoot me an email @ hi@arimgibson.com? I only get one reply here so unfortunately cannot continue a conversation, but would love to get to the bottom of this. I tested extensively on Firefox without issues before releasing but would bet you're not the only one. Thank you!!! ~ Ari

Edit 2/17/25 6:35a UTC: just pushed a patch fix that likely resolves your issue! Please give that a try and if you're still having issues, file a bug on our GitHub or shoot me an email at hi@arimgibson.com. Thanks!