It's our private server and all limits are set by us. It is protective system of the site (we use this system on great number of our sites and servers) and I can't give you more detailed explanations :) Unfortunately the problem with this option in Firefox will be and we are not interested in solving this problem.
I ran into this same problem after being able to browse tabbed just fine for a few days, but now I appear to be blocked from the english portion of the site. I'm using google translator to navigate but its a bit tougher obviously. I love the site and would love to be able to use it again as its a great resource, is there any way to get unblocked, like a time limit or something you could do? Now that I know there is a limitation I won't browse the same way. Is there a specific number of tabs/windows to be limited to or is it just anything over one connection?
Any help would be appreciated!
Edit: It appears I can access the site now, thank you.