Unable To Run Any Selenium Unit Tests

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Meta -

OS: OSX 10.11.6

Selenium Version:
3.0.0b2
Browser:
FF 48.0.2 (I am aware of the issue using geckodriver. Geckodriver is currently in the PATH)

Expected Behavior -

running ./go test_py Would run all python tests for them to pass.

Actual Behavior -

All tests fail with the E (error code) They all have the same error.

======================================================================
ERROR: test_we_can_launch_multiple_firefox_instances (__main__.FirefoxLauncherTests)
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Traceback (most recent call last):
  File "ff_launcher_tests.py", line 39, in test_we_can_launch_multiple_firefox_instances
    self.webdriver1 = webdriver.Firefox(capabilities=capabilities)
  File "/Users/jdorlus/.virtualenvs/selenium-test/lib/python2.7/site-packages/selenium-3.0.0b2-py2.7.egg/selenium/webdriver/firefox/webdriver.py", line 85, in __init__
    self.binary, timeout)
  File "/Users/jdorlus/.virtualenvs/selenium-test/lib/python2.7/site-packages/selenium-3.0.0b2-py2.7.egg/selenium/webdriver/firefox/extension_connection.py", line 52, in __init__
    self.binary.launch_browser(self.profile, timeout=timeout)
  File "/Users/jdorlus/.virtualenvs/selenium-test/lib/python2.7/site-packages/selenium-3.0.0b2-py2.7.egg/selenium/webdriver/firefox/firefox_binary.py", line 68, in launch_browser
    self._wait_until_connectable(timeout=timeout)
  File "/Users/jdorlus/.virtualenvs/selenium-test/lib/python2.7/site-packages/selenium-3.0.0b2-py2.7.egg/selenium/webdriver/firefox/firefox_binary.py", line 108, in _wait_until_connectable
    % (self.profile.path))
WebDriverException: Message: Can't load the profile. Profile Dir: /var/folders/py/xhpmll4n68s689s14p8tktlh0000gp/T/tmpzPfr_B If you specified a log_file in the FirefoxBinary constructor, check it for details.

Steps to reproduce -

1.) Download and upgrade Selenium 3.0.0b2 to latest commit
2.) Download geckodriver and build from source from latest commit
3.) Put gecko driver in PATH (i.e. /usr/local/bin)
4.) Navigate to selenium root folder
5.) Make sure you have FF 48.0.2 installed
6.) Run ./go test_py

[davehunt]

@silne30 running ./go test_py runs the FirefoxDriver which will not work with Firefox 48. Try ./go //py:marionette_test:run to run the Marionette tests with Firefox 48, or switch to Firefox 47.0.1 to run the FirefoxDriver tests.