[experimental]

App Tabs, In-content UI (like preferences in a tab), HTML/CSS/JS extension model and about:labs (proof on Aza Raskin's blog)

These are just a few things Google has copied from Mozilla. I don't go around complaining about all the thing Google has copied from Mozilla, but the record has to be set straight, Mozilla is not following Google, they are going there own way. They implemented sandboxed Flash first and compartments which Chrome is missing.

Funny that Google haven't updated the Google toolbar.

"It doesn't take a conscious effort to make software incompatible. All you have to do is not work too hard at fixing bugs—which, if you're a big company, you produce in copious quantities. The situation is analogous to the writing of "literary theorists." Most don't try to be obscure; they just don't make an effort to be clear. It wouldn't pay." - Paul Graham http://paulgraham.com/microsoft.html

Embrace, Extend, Extinguish.