I was noticing odd jerky performance with Firefox 3.1b3 that wasn’t making sense. So I ran the SunSpider benchmarks on FF3.1b3 and FF 3.0.8 with Firebug on and off. FF 3.0.8 with FB on is faster (5308) than FF3.1b3 with FB (beta) on (8350) which was a bit of a shock.
I eagerly await the official release of FF3.5 and the core add-ons updating to follow.
