A few weeks back we’ve already posted about YSlow, a free plugin from Yahoo that works on top of Firebug that additionally computes a performance grade report for your website.

A new version has now been released: YSlow v0.9.3, and one of it’s notable new features is that it works now on Firefox 3 beta3 and later. For those that didn’t try Firefox 3 yet, we can already say it improves rendering speed and uses a lot less memory then Firefox 2. Unfortunately not all the plugins have been made compatible yet with Firefox 3, so you may want to wait a bit before removing Firefox 2.