Web scraping: webbrowser issue

[Truman]

Im not too sure about windows but you may have to register it?

import webbrowser
ffpath = 'C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe'
print(webbrowser._tryorder)
webbrowser.register('firefox', None, webbrowser.BackgroundBrowser(ffpath), 1)
print(webbrowser._tryorder)
ff = webbrowser.get('firefox')
ff.open("http://www.google.com")

this is what I get

Error:
['windows-default', 'C:\\Program Files (x86)\\Internet Explorer\\IEXPLORE.EXE']
Traceback (most recent call last):
  File "C:\Python36\kodovi\browsers.py", line 3, in <module>
    wb.register('firefox', None, wb.BackgroundBrowser(ffpath), 1)
NameError: name 'ffpath' is not defined

I practise Python on old laptop that has Windows 7. What I did is that I made Firefox a default browser through itself - Tools > Options. It's a simplier option, but I wanted to know is it possible to change a browser through a code.