Alrighty. Okay.

♪ (inspirational piano music) ♪

<i>ahem</i>

Feeling good.

<i>exhale</i>

Why fix something that isn't broken? I hate that question. <i>laugh</i>

UIs are a bit like fashion - sometimes you change the way your clothes looks,

even though the clothes isn't broken.

Sometimes you need a new fresh look on something.

Aesthetics change and we learn lessons over time

and we have to correct our mistakes from the past.

I'm really excited to talk to the world about these changes.

Our users have changed, their behaviors have changed,

competitors have changed, the way people use the Web,

the Web has changed, right?

Those little things, the little refinements that just

take something from a good idea to - you know. <i>woosh</i>

Beautiful.

I mean, we already hear about people who click that bookmark

and then unbookmark and bookmark again, just to see it go,

right? And that's what you want, you want these little

delightful moments.

Biggest under-the-hood change was the way we do customization.

If you remove all of the buttons out of the menu panel,

now we show a bouncing unicorn.

Tabs! You wouldn't think it would be such an impassioned topic,

but it is.

No, there's been no physical violence.

Those tabs are, like, buttery smooth now.

Why curvy tabs?

We've gone from kind of the square tabs

and we wanted something more aerodynamic.

They're smooth as silk.That's something I'm particularly proud of.

We put a lot of work into making them look aerodynamic,

so they actually appear faster, but we also put a lot of work on

the technical side, to make them actually be faster.

Madhava with a tab strapped to his head to prove that our tabs

are 20% more streamlined than the competition.

With the air flowing over it in a wind tunnel.

It was surprisingly hard.

Our engineers are just amazing, they're magicians and they

can make anything happen.

This is the biggest change that I've seen in Firefox in its history.

♪ (inspirational piano music) ♪