title: Issue with browser = Browser('firefox') part of my code
body: <p>I am running updated versions of my all modules within my python. I am using conda-forge and spyder 3.7.</p>
  
  <p>I am just attempting to open a webpage using some basic code and I get stuck there.</p>
  
  <p>I have searcher just about everywhere on the site, but I am not sure what I should do since I am quite new to this.</p>
  
  <p>I have updated the modules I am using and continued after every update but it was to no avail.</p>
  
  <p>Here is my code: </p>
  
  <pre><code>from splinter import Browser
  browser = Browser('firefox')
  browser.visit('https://google.com')
  </code></pre>
  
  <p>Previously written as:</p>
  
  <pre><code>from splinter import Browser
  browser = Browser()
  browser.visit('https://google.com')
  </code></pre>
  
  <p>Same issue with both.</p>
  
  <p>Here is the error:</p>
  
  <pre><code>Traceback (most recent call last):
  
    File "&lt;ipython-input-12-71643798329a&gt;", line 2, in &lt;module&gt;
      browser = Browser('firefox')
  
    File "build/bdist.macosx-10.5-x86_64/egg/splinter/browser.py", line 53, in Browser
      return driver(*args, **kwargs)
  
    File "build/bdist.macosx-10.5-x86_64/egg/splinter/driver/webdriver/firefox.py", line 33, in __init__
      self.driver = Firefox(firefox_profile)
  
    File "C:\Users\lkerzabi\AppData\Local\Continuum\anaconda3\lib\site-packages\selenium\webdriver\firefox\webdriver.py", line 174, in __init__
      keep_alive=True)
  
    File "C:\Users\lkerzabi\AppData\Local\Continuum\anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 157, in __init__
      self.start_session(capabilities, browser_profile)
  
    File "C:\Users\lkerzabi\AppData\Local\Continuum\anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 252, in start_session
      response = self.execute(Command.NEW_SESSION, parameters)
  
    File "C:\Users\lkerzabi\AppData\Local\Continuum\anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
      self.error_handler.check_response(response)
  
    File "C:\Users\lkerzabi\AppData\Local\Continuum\anaconda3\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
      raise exception_class(message, screen, stacktrace)
  
  SessionNotCreatedException: Unable to find a matching set of capabilities
  </code></pre>
  
  <p>I expect to be able to open a webpage, but it just gives me this error.</p>