Trying to test a page tests run only with Chrome.
At Firefox test fails with an error
Error starting Firefox: 'module' object has no attribute 'ensure_binary'
At MicrosoftEdge (EdgeHTML) tests fail with
Error starting browser: Message: Unknown error
 Dulles, VA - Thinkpad T430 - Firefox - 3GFast
 Dulles, VA - Thinkpad T430 - Microsoft Edge (EdgeHTML) - 3GFast
What could this mean? I can’t really attribute the cause of these errors:
 is it the tested website which reacts anyhow wrong?
 Or is it really the test engine, which has problems with this certain website?