Using NetExtender
Step 4 The Firefox Software Installation window displays. Click Install to allow Virtual Office to install NetExtender,
Step 5 Firefox may prompt you to restart your browser. If so, close Firefox, relaunch it, and return to the Virtual Office window. Click NetExtender again.
Step 6 You may see additional security warnings. A User Account Control window may appear asking “Do you want to allow this program to make changes to this computer?” Click Yes.
Step 7 A Windows Security window may appear asking “Would you like to install this device software?” Click Install.
SonicWALL SSL VPN 5.5 User Guide