Congratulations to the developers of Zen, they've done so well with it.

I can't help but be envious at the attention they've been getting the past year or so, it's what I only dreamed of what I would achieve with Waterfox. In a sense, I'd always hoped I'd end up being the alternative to the big boys, but I never quite got there - good for them.

customising firefox is just much better, give it a go