I'm not entirely sure if this will help, but in Firefox, type into the address bar about:config

Then type into the filter "network.http.connect.timeout"
Right-click on that and hit "Modify" then enter a higher value.

I'd imagine that's the variable that controls timeout attempts, though I'm not sure if it's in seconds or milliseconds or what.

If that doesn't work, try typing "timeout" into the filter and playing around with the variables that show up.