I normally use the Desktop version, but because that won't send PCBs to fab (see other bug) I use Firefox to do the final submission and just noticed that the mouse wheel doesn't zoom into the PCB like the Desktop version does. Is this a Firefox bug or yours ? The menu zoom works but that is slow to use and just a few settings.
Electron
4.2.10
Windows
10
EasyEDA
6.5.22