No, I consciously made that impossible because signatures shouldn't have been this big to begin with. I think there was a rule setting a max size at some point, but it hasn't been enforeced in ages.

Ideally signatures aren't larger than the message itself. Even with the current rules that's not necessarily the case, but at least it's better than before.

(I guess if you really want to see the full signatures you can use NoScript or something to block https://www.jazz2online.com/scripts/forum.js. Though that's not guaranteed to keep working forever)