Error FF Browser not working for Selenium test after update

Question

On my Ubuntu Desktop 16.04, Selenium WebDriver cannot open browser for testing. Before updating, it was all fine, but after updating Firefox I get the following error:

Traceback (most recent call last):
  File "test.py", line 6, in <module>
    driver = webdriver.Firefox()
  File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/firefox/webdriver.py", line 81, in __init__
    self.binary, timeout)
  File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/firefox/extension_connection.py", line 51, in __init__
    self.binary.launch_browser(self.profile, timeout=timeout)
  File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/firefox/firefox_binary.py", line 68, in launch_browser
    self._wait_until_connectable(timeout=timeout)
  File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/firefox/firefox_binary.py", line 98, in _wait_until_connectable
    raise WebDriverException("The browser appears to have exited "
selenium.common.exceptions.WebDriverException: Message: The browser appears to have exited before we could connect. If you specified a log_file in the FirefoxBinary constructor, check it for details.

Answer 1

Since Firefox's latest update to version 47.0, a new driver must be used. Probably because of Mozilla updating their terms and policies of use. To get things running, either use: 

1. Marionatte driver which is an extension to the Firefox browser

DesiredCapabilities capabilities = DesiredCapabilities.firefox();
capabilities.setCapability("marionette", true);
Webdriver driver = new FirefoxDriver(capabilities);

2. Use Gecko driver which is the driver provided by Firefox for selenium tests

system.setproperty("webdriver.gecko.driver","path to geckodriver.exe");
WebDriver driver = new FirefoxDriver();