Firefox Build does not work with Selenium

Question

for my research, I did some source code modifications in firefox and build it myself. In order to automate testing, I opted to use Selenium but unfortunately, my newly built

Answer 1

Spent an hour on this same issue. For Python3 remember to pip3, otherwise it will only upgrade selenium on Python2, and you'll be left wondering why it's still not working.

sudo pip3 install -U selenium