not necessarily looking for help, but just a quick info to possibly save others from hours of frustration:
The e2e webdriver extension install failed for me when using node 12. Apparently, the dependencies to wdio-sync cause yarn to install fibers@3; which does not work with node 12.
Installing node 10 instead of 12 solved the problem for me.
I’m using Ubuntu 18.04, but I’m not sure the OS makes a difference here.
Did anyone else get e2e-webdriver running with node 12? If yes, what am I missing?