There is a known fix for a related problem in Linux distros, but unfortunately I have seen no fix for this issue under Windows, which is related to the management of your networking connection. It is not specifically an XP issue, but all you can do is manually switch back to Online mode or restart your browser each time it happens.
I searched this forum for a fix but didn't find one addressing the FF Offline problem in Win XP.
FF goes offline when it wants to. Sometimes on FF start up and sometimes in the middle of a work session.
Any good fix to stop this from happening? Thanks.