Mozilla is toying with Firefox 4.0 concepts.
Last week we got a sneak peek at some possible interface changes that we could see in Firefox 3.7, which showed definite influence from Google's Chrome browser.
Today designer Stephen Horlander showed of some more interface concepts that we might see when Firefox 4.0 rolls around.
"These are not final," Horlander declared once again on the webpage. "They are only for brainstorming [and] exploration."