Can't open browser with Selenium after Firefox

Question

I use Selenium WebDriver on Ubuntu Desktop 16.04, and I can't open browser. I get the following error after Firefox update (before this, it all worked):

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

As of Firefox version 47.0 (which came out a little while a go), a new driver must be used (created by mozilla instead of selenium) to connect to Firefox, because of a bug introduces in this version. As of Firefox version 48.0 the old driver will be deprecated completely and only Marionette can be used so it is better to switch now. See: Marionette Webdriver for Firefox

Download the driver (in OSX just use brew install geckodriver), rename the executable to wires.exe on windows, or wires on *nix systems, and make sure the executable is present in your system path, then use this driver in your program instead of the old driver by using the following:

When using a local webdriver:

Python:

firefox_capabilities = DesiredCapabilities.FIREFOX
firefox_capabilities['marionette'] = True

driver = webdriver.Firefox(capabilities=firefox_capabilities)

Ruby:

driver = Selenium::WebDriver.for :firefox, marionette: true

Javascript:

var capabilities = Capabilities.firefox();
capabilities.set('marionette', true);

var driver = new webdriver.Builder().withCapabilities(capabilities).build();

Java:

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

C#:

var driver = new FirefoxDriver(new FirefoxOptions());

When using selenium grid:

When using a selenium grid the driver should be present in the path for all machines in your grid.

Python:

firefox_capabilities = DesiredCapabilities.FIREFOX
firefox_capabilities['marionette'] = True
driver = webdriver.Firefox(capabilities=firefox_capabilities)

Ruby:

caps = Selenium::WebDriver::Remote::Capabilities.firefox marionette: true
driver = Selenium::WebDriver.for :firefox, desired_capabilities: caps

Java:

DesiredCapabilities capabilities = DesiredCapabilities.firefox();
// Set Marionette on so the Grid will use this instead of normal FirefoxDriver
capabilities.setCapability("marionette", true);

WebDriver driver = new RemoteWebDriver(capabilities); 

C#:

DesiredCapabilities capabilities = DesiredCapabilities.Firefox();
// Set Marionette on so the Grid will use this instead of normal FirefoxDriver
capabilities.SetCapability("marionette", true);

var driver = new RemoteWebDriver(capabilities); 

Answer 2

Solution : Upgrade Firefox to 47.0.1 and Selenium to 2.53.1.

This combination worked for me.

For more details refer to https://stackoverflow.com/a/37728659/6469532

Answer 3

No need to downgrade Firefox. I have faced issue with Windows and Firefox 49 version. I was using geckodrvier 64 bit version. I changed it to geckodrvier 32 bit version and it solved the issue. Now browser is opening properly without any issue.

Answer 4

1) Download geckodriver 0.6.2, unzip, rename to "wires" not "wires.exe" https://github.com/mozilla/geckodriver/releases

2) Add the wires executable location to PATH (I put this in my python folder C:Program Files\Python...) Select Start, select Control Panel. double click System, and select the Advanced tab. Click Environment Variables. ... In the Edit System Variable (or New System Variable) window, specify the value of the PATH environment variable. ... (Use ';' to separate paths i.e. [C:Users\Reuben;C:Program Files\Python]

3) Downgrade to Firefox 45 https://ftp.mozilla.org/pub/firefox/releases/45.0.2/win64/en-US/

Answer 5

FIXED: Solution at this time is to downgrade Firefox! run this command to get a list of available Firefox versions.

apt-cache show firefox | grep Version

My Result:

Version: 47.0+build3-0ubuntu0.16.04.1
Version: 45.0.2+build1-0ubuntu1

Install:

sudo apt-get install firefox=45.0.2+build1-0ubuntu1

To keep this version and disallow updates:

sudo apt-mark hold firefox

If you want to unhold firefox version and allow updates:

sudo apt-mark unhold firefox
sudo apt-get upgrade

Answer 6

Some people have the problem that some buttons or select boxes cannot be selected inmarionette modus.

An alternative is using older firefox version:

You can download the binary here and use it here:

from selenium import webdriver
from selenium.webdriver.firefox.firefox_binary import FirefoxBinary

binary = FirefoxBinary('path/to/binary')
driver = webdriver.Firefox(firefox_binary=binary)