Unable to test extended attributes at location '/home/username/.wine-browser'.

Does it actually say '/home/username/.wine-browser' or is "username" replaced with your username?

username is replaced with my username. This is the actual error message " Unable to test extended attributes at location '/home/james/.wine-browser'. " Thanks!

Could you please run the following command?:
/usr/share/wine-browser-installer/test-xattr $HOME/.wine-browser; echo "$?"

This is what I got:
Traceback (most recent call last):
  File "/usr/share/wine-browser-installer/test-xattr", line 3, in <module>
    import xattr
ImportError: No module named xattr

Are you running Ubuntu? If so then then the package "python-xattr" should be installed automatically by the package manager...

Yes, I'm running Ubuntu. After running /usr/share/wine-browser-installer/test-xattr $HOME/.wine-browser; echo "$?", I download "python-xattr" and tried to install it using python setup.py install. I had errors about the the libffi package not found. I installed the libffi-dev from the synaptic package manager, and I ran "/usr/share/wine-browser-installer/test-xattr $HOME/.wine-browser; echo "$?" again. It returned 0.

Hi James, that should fix your problem then. There should actually be a package dependency on python-xattr, so that should not have been necessary. Do you have a custom python install?

It didn't fix the issue. I have Enthought Canopy installed on my machine, so Enthought Canopy Python 2.7.6 is set as the default version. I'm thinking it conflicted with Python 2.7.6 since I have both Enthought Canopy Python 2.7.6 and Python 2.7.6 installed on my machine. I also have Python 3.4.0.

So, to be clear:
/usr/share/wine-browser-installer/test-xattr $HOME/.wine-browser; echo "$?"
returns "0". But launching netflix-desktop still returns an error?

Yes.

Hmm, I'm not sure how that's possible... The exact lines are:
"${PKG_DIR}/test-xattr" "${WINEPREFIX}";
XATTR="$?";
if [ "${XATTR}" -ne "0" ]; then
    ... <-- create appropriate error message
fi

previously it sets:
PKG_DIR="/usr/share/wine-browser-installer";
and in your case:
export WINEPREFIX="/home/james/.wine-browser";

So, if that command you tested before works then netflix-desktop should work as well. You could try editing /usr/bin/wine-browser to give you some diagnostics, but at this point it should really be working.

i am having the same problem and i got "0" as a response to

 /usr/share/wine-browser-installer/test-xattr $HOME/.wine-browser; echo "$?"

Well, you could try copying /usr/bin/wine-browser to another place (like your home directory) and then add a line after these two lines:
"${PKG_DIR}/test-xattr" "${WINEPREFIX}";
XATTR="$?";
to read something like:
echo "${PKG_DIR}/test-xattr ${WINEPREFIX}: $XATTR";

That should give us a better idea as to why it's failing.