Some guy on the net thought of a clever way to make Google Analytics unable to collect data under Firefox browsers. First of all, he spelled Firefox wrong. It's "Firefox", not "FireFox". He achieved this by using the adblock extension (not "plug-in", as he said) to block *.google-analytics.com.

After using this "counter-anti-block" method, the only way to avoid is to turn off JavaScript.

OK, here's the deal: Just link a dummy JS file. Make this JS file a PHP script that remotely reads the JS code from http://www.google-analytics.com/urchin.js.
Using this way, the only so-callled "defense" is to turn off JavaScript. Gotcha.