Slow, needs huge resources, does not load for large pages/graphics, highlighting (be other addons) is lost, text pieces option cannot be saved as before, needs always 2 tabs, why? As long as only WE is available for the new firefox this is a
show stopper
for firfox release 57. I'll stay with firefox 56 and non-WE PrintEdit. Even if firefox is somewhat slower...
Ergo: You should make PrintEdit non-WE kompatible for firefox 57. No other way.