[UI-Tests] Add preference that prints console logs to geckodriver log. (#10958)
[UI-Tests] Add preference that prints console logs to geckodriver log. (#10958)


mozilla/addons-server,kumar303/olympia,eviljeff/olympia,bqbn/addons-server,kumar303/olympia,eviljeff/olympia,wagnerand/addons-server,bqbn/addons-server,bqbn/addons-server,wagnerand/addons-server,psiinon/addons-server,diox/olympia,eviljeff/olympia,diox/olympia,kumar303/addons-server,kumar303/olympia,eviljeff/olympia,bqbn/addons-server,kumar303/addons-server,mozilla/addons-server,kumar303/olympia,mozilla/olympia,mozilla/olympia,mozilla/olympia,wagnerand/addons-server,diox/olympia,mozilla/olympia,kumar303/addons-server,psiinon/addons-server,kumar303/addons-server,wagnerand/addons-server,psiinon/addons-server,mozilla/addons-server,mozilla/addons-server,diox/olympia,psiinon/addons-server