Linux Mint Forums

Please open Firefox and type into address bar about:config
if is the first time you are unsing about:config on firefox, a warning windows come in front of you please confirm the "promise".

Then search ( type the name into the "filter row" field ) for the firefox config param named network.online

double click on the filtered row and set it to true

quit and restart firefox

Hope this helps

Disable and stop Network Manager from services(System->Administration->Services, in Services configuration page stop and disable Network Manager).

toolkit.networkmanager.disable
to true in about:config

open /etc/network/interfaces and make look like this:
auto lo
iface lo inet loopback
address 127.0.0.1
netmask 255.0.0.0