"Can't load the profile" error occured with Selenium WebDriver by Python3.5 and FF48

Question

 I'm trying to use Selenium with Python.
 So, I wrote the following codes and save as the file named test.py in working directory /Users/ykt68/seleniumwork .

[ykt68@macbp15 seleniumwork]$ pwd
/Users/ykt68/seleniumwork
[ykt68@macbp15 seleniumwork]$ cat -n test.py

     1  #! /usr/bin/env python
     2  # -*- encoding: utf-8 -*-
     3  
     4  from selenium import webdriver
     5  from selenium.webdriver.common.keys import Keys
     6  
     7  driver = webdriver.Firefox()
     8  driver.get("http://www.python.org")
     9  assert "Python" in driver.title
    10  elem = driver.find_element_by_name("q")
    11  elem.clear()
    12  elem.send_keys("pycon")
    13  elem.send_keys(Keys.RETURN)
    14  assert "No results found." not in driver.page_source
    15  driver.close()

[ykt68@macbp15 seleniumwork]$

 These codes above are the same as 2.1 Simple Usage in documents of Selenium with Python.

 When I ran the python command for test.py above,

• FireFox browser started and opened a blank tab.
• And after about 30 seconds have passed, the following error messages were displayed and FireFox window was closed.

[ykt68@macbp15 seleniumwork]$ python test.py 
Traceback (most recent call last):
  File "test.py", line 7, in <module>
    driver = webdriver.Firefox()
  File "/Users/ykt68/.pyenv/versions/seleniumwork/lib/python3.5/site-packages/selenium/webdriver/firefox/webdriver.py", line 80, in __init__
    self.binary, timeout)
  File "/Users/ykt68/.pyenv/versions/seleniumwork/lib/python3.5/site-packages/selenium/webdriver/firefox/extension_connection.py", line 52, in    __init__
    self.binary.launch_browser(self.profile, timeout=timeout)
  File "/Users/ykt68/.pyenv/versions/seleniumwork/lib/python3.5/site-packages/selenium/webdriver/firefox/firefox_binary.py", line 68, in launch_browser
    self._wait_until_connectable(timeout=timeout)
  File "/Users/ykt68/.pyenv/versions/seleniumwork/lib/python3.5/site-packages/selenium/webdriver/firefox/firefox_binary.py", line 108, in _wait_until_connectable
    % (self.profile.path))
selenium.common.exceptions.WebDriverException: Message: Can't load the profile. Profile Dir: /var/folders/86/55p1gj4j4xz2nw9g5q224bk40000gn/T/tmpf0uolidn If you specified a log_file in the FirefoxBinary constructor, check it for details.

[ykt68@macbp15 seleniumwork]$

 Please teach me why this error has occured and how to solve the problem or list some posts or documents I should refer.

 In addition,

1. Environments:
   • OS: Apple OS X Version 10.11.6
   • Python Version: 3.5.2
   • FireFox Version: 48.0.2
   • selenium Version: 2.53.6

[ykt68@macbp15 seleniumwork]$ python -V
Python 3.5.2
[ykt68@macbp15 seleniumwork]$ /Applications/Firefox.app/Contents/MacOS/firefox -v
Mozilla Firefox 48.0.2
[ykt68@macbp15 seleniumwork]$ /Applications/Firefox.app/Contents/MacOS/firefox-bin -v
Mozilla Firefox 48.0.2
[ykt68@macbp15 seleniumwork]$ pip list
pip (8.1.2)
selenium (2.53.6)
setuptools (20.10.1)
[ykt68@macbp15 seleniumwork]$

2. I reffered the similar post of Selenium: FirefoxProfile exception Can't load the profile. So I tried

pip install -U selenium

But the situation with error messages above remains unchanged.

Best Regards.

Answer 1

From what I understand and concluded, you can keep the latest selenium package version, but you have to downgrade Firefox to 47 (47.0.1 is the latest stable from the 47 branch).