I used to run a 700MHZ powerbook, and the fan used to whir away. One day I realised that having Firebug running wasn't helping! But I foolishly hadn't even considered it, as I was so used to running the extension. Adblock Plus I pretty much always install too, so would just think it was normal. It still feels much better than running the adverts!

I did try noscript for a while, but I got fed up having to turn it on for sites that just failed to work without JS, and got bored moaning about it.