Ubuntu Networking :: Firefox Addons Not Allowed - Error 228

I had firefox having an inability to download addons, so I edited the dhclient.conf file by entering the following into a terminal:

Code:
sudo gedit /etc/dhcp3/dhclient.conf
When the document opened, I edited the line that starts prepend domain-name-servers to read:

Code:
8.8.8.8,8.8.4.4;
Saved and closed the file. I went back to the terminal and opened the nsswitch.conf file by entering:

Code:
sudo gedit /etc/nsswitch.conf

When the document opens, I edited the line hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4 to read:

Code:
hosts: files dns
Saved and exited the document. To be on the safe side, I restarted my computer after making the edits. [/QUOTE]

This was done following the thread someone wrote on a similar error: [URL]. Still does not allow addons...