Works on v 4.2.2

Thank you so much, trying to let our users have freedom with signatures has lead to a nightmare of trying to also keep the size of signatures in check, this is perfect!
Only issue so far is it doesn't seem to work on Firefox. Works on Chrome and Safari, though. I'm using Firefox ESR so that may have something to do with it. I'm trying to find friends who have the regular Firefox to test it and see if it works for them.