no, unfortunately this is not the problem, I have the firefox version 121.0 which is the latest, I tried to run an update anyway but the problem is still here
It is not a browser problem, but BBcode variables give different results between browsers, as the way to deal with variables such as tt pt px gives different results.
I can modify the signature code to give a better result for all browsers, but I think that icopress already has a signature designer, and the campaign has not officially started yet.