Firewall settings - incomplete TCP/UDP sessions

Hello,

I've had increasing problems with my h/w firewall over the past weeks
due to 'syn flood to host (outbound)' problems.
Turns out my modded version of firefox triggers the f/w to hysterically
shut down the connection (flood control).
(I still don't know why this has only recently become a problem, as
I've made NO h/w or s/w changes, and have no viruses/spyware.)

I've basically tried to desensitise the f/w by adjusting:
'Maximum incomplete TCP/UDP sessions number from same host', (which was
originally 10) to 50 (max). This seems to work for the moment.

I don't want to set this too high, leaving my network vulnerable to dos
attacks, but I also don't want my surfing restricted by my own
firewall(!)
What is the correct (permissible) maximum value I should have this set
to?

Re: Firewall settings - incomplete TCP/UDP sessions

Post removed (X-No-Archive: yes)