How to fix Selenium WebDriverException: The browser appears to have exited before we could connect?

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I have installed firefox and Xvfb on my centos6.4 server to use selenium webdriver.

But, when I run the code, I got an error.

from selenium import webdriver
browser
= webdriver.Firefox()

Error

selenium.common.exceptions.WebDriverException: Message: 
'The browser appears to have exited before we could connect. The output was: None'

I read some related pages on stackoverflow and someone suggested to remove all files in tmp folder, so I did it. But, it still doesn’t work.

Could anyone please give me a help?

Thank you in advance!

Edit

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.4/site-packages/selenium/webdriver/firefox/webdriver.py", line 59, in __init__
self
.binary, timeout),
File "/usr/local/lib/python3.4/site-packages/selenium/webdriver/firefox/extension_connection.py", line 47, in __init__
self
.binary.launch_browser(self.profile)
File "/usr/local/lib/python3.4/site-packages/selenium/webdriver/firefox/firefox_binary.py", line 64, in launch_browser
self
._wait_until_connectable()
File "/usr/local/lib/python3.4/site-packages/selenium/webdriver/firefox/firefox_binary.py", line 103, in _wait_until_connectable
self
._get_firefox_output())
selenium
.common.exceptions.WebDriverException: Message: 'The browser appears to have exited before we could connect. The output was: None'
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for Googlers, this answer didn’t work for me, and I had to use this answer instead. I am using AWS Ubuntu.

Basically, I needed to install Xvfb and then pyvirtualdisplay:

sudo apt-get install xvfb
sudo pip install pyvirtualdisplay

Once I had done that, this python code worked:

#!/usr/bin/env python
from pyvirtualdisplay import Display
from selenium import webdriver
display
= Display(visible=0, size=(1024, 768))
display
.start()
browser
= webdriver.Firefox()
browser
.get('http://www.ubuntu.com/')
print browser.page_source
browser
.close()
display
.stop()

Thanks to @That1Guy for the first answer

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