I am actually a heavy tab user, usually every time I am browsing the Internet, I opened average 10 tabs and maybe more. My desktop PC is running on 2.66Ghz Pentium 4 which is quite slow for a heavy tab user like me. I’ve tested a lot of browsers that doesn’t require a lot of resources even when opening lots of tabs. So far, I found that Flock 1.2.1 is very suitable for me. Flock is a browser with Web 2.0 features, built on Firefox. Flock 1.2.1 is based on Firefox 2.