I ran some Sun Spider benchmarks on my laptop running Ubuntu 10.10. Here are the results.

• Chrome 10.0.612.1 dev: 385.8 ms
• Chromium 10.0.627.0 (70377): 383.0 ms
• Opera 11.00 build 1156: 369.8 ms
• Firefox 3.6.13: 2301 ms
• Firefox (Minefield nightly build) 4.0b9pre (2011-01-05): 318.9 ms

It's good to see Mozilla jumping into the pot with blazing fast benchmarks for JavaScript. There is of course a lot more to having a snappy web experience than the speed of your JavaScript interpreter, but it certainly does help. I actually used Opera 10.60 for awhile but even though it was beating Chrome in the benchmarks, it didn't feel as smooth. I'll have to try out Firefox 4.0 beta and see if it compares favorably to Chrome, or if the JavaScript speed-up is just some lipstick on the same pig.