I've just done a couple of things, activating a new sim and transferring a number to an existing smarty sim. In both cases there were minor issues.
- Email links wrapped with maildrill fail on both firefox and chrome
{"status":406,"message":"Not Acceptable"}
- Transferring a number to a smarty sim by putting the pac code in account settings -> your number fails on Firefox. In particular the check my details button does not check the details then proceed, it just disappears. All ad block script blocking etc was disabled on firefox when I tried this, Firefox v120 on Linux.
I managed to fix the second issue by using chrome, but it's something the devs should look into as incompatibility with firefox is not great.