<p>The two connection limit can be particularly troublesome when you have multiple tabs open simultaneously.  Besides "ignore the problem," what coping mechanisms have you seen used to get multiple tabs both doing heavily interactive Ajax despite the two connection limit?</p>

The two connection limit is a "suggestion" and this
article
describes how to get around it where possible.  Other Firefox configuration is discussed on this about the
about:config
capability in Firefox.
Also, if you own the website, you can tweak the performance of the site using suggestions form this
book
from the Chief Performance Yahoo.