selenium.common.exceptions.WebDriverException: Message: Process unexpectedly closed with status 1 - selenium

Question

version:
firefox : Mozilla Firefox 61.0
geckodriver : geckodriver v0.20.1
I only tried below code:
from selenium import webdriver
browser = webdriver.Firefox()
But getting an error as below:
Traceback (most recent call last):
File "my.py", line 3, in <module>
browser = webdriver.Firefox()
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/firefox/webdriver.py", line 170, in __init__
keep_alive=True)
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 156, in __init__
self.start_session(capabilities, browser_profile)
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 245, in start_session
response = self.execute(Command.NEW_SESSION, parameters)
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 314, in execute
self.error_handler.check_response(response)
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: Process unexpectedly closed with status: 1
And geckodriver.log:
1528101123327 geckodriver INFO geckodriver 0.20.1
1528101123336 geckodriver INFO Listening on 127.0.0.1:43481
1528101124336 mozrunner::runner INFO Running command: "/usr/bin/firefox" "-marionette" "-profile" "/tmp/rust_mozprofile.y93GPXwtXuKC"
Running Firefox as root in a regular user's session is not supported. ($XAUTHORITY is /home/username/.Xauthority which is owned by username.)
It's only makes a problem in root account , Please help..

Answer 1

This error message...
Running Firefox as root in a regular user's session is not supported. ($XAUTHORITY is /home/keti/.Xauthority which is owned by keti.)
...implies you were either trying to invoke Firefox Browser as a root user or running Firefox Browser as root in a non-root session.
As per User's Firefox process runs as root (if root is running Firefox) both the cases are not supported and should have been relatively difficult to achieve. But technically it was still possible (as the --new-instance and --no-remote flags are available to control remote control) but X11's permissive security model meant an user should basically treat the user account as if it had passwordless sudo.
There were a couple of issues associated as follows:
If a user runs Firefox as root but using their own home directory, many things become broken for that user, sometimes permanently.
When firefox is running as root, other users on the same display can gain root privileges
With the GA (General Availability) of Firefox v60.0 Mozilla Team decided to Disallow Firefox from running as sudo as:
Use clone() instead of fork() for sandboxed Linux processes and remove SandboxEarlyInit etc.
Earlier running sudo firefox, which previously seemed to work but was unsupported, now will fail to load content (tab crash on any page) on most Linux Distributions and it will fail to start and print a message as:
Running Firefox as root in a regular user's session is not supported. ($XAUTHORITY is /home/username/.Xauthority which is owned by username.)