javascript - Why does Firefox error message pop up when running Protractor test? -

i e2e testing angularjs app protractor.

each time run spec, firefox opens, quits pops up:

and firefox works , specs run fine. stays infront of whatever i'm working on after test , annoying. fixes?

i running protractor, configured on localhost:4444, , using firefox browser (firefox 39), , running on mac osx 10.

i saw posted on protractor github page no 1 seems have answer quite yet figured i'd ask here well. https://github.com/angular/protractor/issues/2297

this due compatibility issues between selenium webdriver , firefox. i've had problem before until i've downgraded firefox to, @ most, 37 , updated selenium webdriver latest version (currently 2.46):

webdriver-manager update 

see also:

• firefox crash when run selenium unit test
• firefox crashes when started selenium firefox driver