[ubuntu-uk] OT: Firefox Officeanados

[mac]

LeeGroups wrote:
> Errrr.... Use a local file server,   like in the Advanced settings 
> tab,   last box,   "Use Own Server" check box....

Sorry for being stupid, but where exactly is this? I've looked in 
Firefox Edit/Preferences/Advanced, where there are four tabs:  General; 
Network; Update; Encryption.  I can't see a "Use Own Server" check box 
in any of them.  Could you give idiot-proof directions?!

Thanks

Mac