Selenium: WebDriverException: Message: newSession on Firefox 63.0

[PaziewskiCezary]

Meta:

OS:

Ubuntu 16.04.5 LTS

Selenium Version:

3.14.1

Browser:

Firefox

Browser Version:

Mozilla Firefox 63.0

Browser Add-ons:

uBlock Origin
To Google Translate
Hoxx VPN Proxy
Easy Youtube Video Downloader Express
Facebook Container
HTTPS Everywhere
Greasemonkey
Enhancer for YouTube™
DuckDuckGo Privacy Essentials
Web Developer
1-Click Downloader (Video or Photo)
Violentmonkey
English (GB) Language Pack
WebRTC Leak Shield
User-Agent Switcher and Manager
Search by Image - Reverse Image Search
No Coin
Cookie Editor
Dark Theme for Google™
Bloody Vikings!
Neat URL
Country Flags & IP Whois
Tomato Clock
View Page Archive & Cache
Swift Selection Search
Downloads sidebar
Open in Reader View
Download Notifications
WebRTC Protect
English (South African) Language Pack
Two Factor Authenticator
File Icon for GitHub, GitLab and Bitbucket
English (CA) Language Pack
Breached

Geckodriver Version:

0.16.1

Python Version:

Python 3.5.2

Expected Behavior:

Should work like on older version.

Actual Behavior:

Browser opens and error occurs.

Traceback:

Traceback (most recent call last):
  File "selenium_fix.py", line 2, in <module>
    driver = webdriver.Firefox()
  File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/firefox/webdriver.py", line 174, in __init__
    keep_alive=True)
  File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/remote/webdriver.py", line 157, in __init__
    self.start_session(capabilities, browser_profile)
  File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/remote/webdriver.py", line 252, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)
  File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: newSession

geckodriver.log:

1540670869060   geckodriver INFO    Listening on 127.0.0.1:37515
1540670883143   geckodriver::marionette INFO    Starting browser /usr/lib/firefox/firefox.sh with args ["-marionette"]
1540670885498   Marionette  DEBUG   Received observer notification profile-after-change
1540670885970   Marionette  DEBUG   Received observer notification command-line-startup
1540670885970   Marionette  DEBUG   Received observer notification nsPref:changed
1540670885970   Marionette  DEBUG   Init aborted (running=false, enabled=true, finalUIStartup=false)

(firefox:24638): Gtk-WARNING **: Theme parsing error: <data>:1:34: Expected ')' in color definition

(firefox:24638): Gtk-WARNING **: Theme parsing error: <data>:1:77: Expected ')' in color definition
1540670886872   Marionette  DEBUG   Received observer notification toplevel-window-ready
1540670893145   Marionette  DEBUG   Received observer notification sessionstore-windows-restored
1540670893146   Marionette  DEBUG   Waiting for delayed startup...
1540670893362   Marionette  DEBUG   Setting recommended pref app.normandy.api_url to 
1540670893362   Marionette  DEBUG   Setting recommended pref app.update.disabledForTesting to true
1540670893363   Marionette  DEBUG   Setting recommended pref security.turn_off_all_security_so_that_viruses_can_take_over_this_computer to true
1540670893364   Marionette  DEBUG   Setting recommended pref browser.safebrowsing.passwords.enabled to false
1540670893365   Marionette  DEBUG   Setting recommended pref toolkit.cosmeticAnimations.enabled to false
1540670893366   Marionette  DEBUG   Setting recommended pref browser.urlbar.suggest.searches to false
1540670893369   Marionette  DEBUG   Setting recommended pref datareporting.policy.dataSubmissionPolicyAccepted to false
1540670893369   Marionette  DEBUG   Setting recommended pref dom.disable_beforeunload to true
1540670893369   Marionette  DEBUG   Setting recommended pref dom.file.createInChild to true
1540670893436   Marionette  INFO    Listening on port 43927
1540670893436   Marionette  DEBUG   Remote service is active
1540670893453   Marionette  DEBUG   Accepted connection 0 from 127.0.0.1:53854
1540670893516   Marionette  TRACE   0 -> [0,1,"newSession",{"acceptInsecureCerts":true,"browserName":"firefox","capabilities":{"desiredCapabilities":{"acceptInsecureCerts":true,"browserName":"firefox"}}}]
1540670893518   Marionette  TRACE   0 <- [1,1,{"error":"unknown command","message":"newSession","stacktrace":"WebDriverError@chrome://marionette/content/error.js:178: ... et@chrome://marionette/content/server.js:245:8\n_onJSONObjectReady/<@chrome://marionette/content/transport.js:490:9\n"},null]

Steps to reproduce:

from selenium import webdriver
driver = webdriver.Firefox()
driver.get('https://github.com/')

[lmtierney]

Upgrade to the latest versions of geckodriver/selenium. See https://firefox-source-docs.mozilla.org/testing/geckodriver/geckodriver/Support.html for more info

[neurascenic]

selenium.common.exceptions.WebDriverException: Message: newSession
Seems to have reared it's head again.
FF: 67.0.4 (64-bit) OSX 10.14.5
geckodriver-v0.24.0-macos.tar.gz
selenium 3.141.0

Same steps to produce as above. Chrome and Safari work.
Will try Beta
Thanks!

[neurascenic]

Behaves the same with current Beta.

Thanks!