Mozilla CEO John Lilly has admitted the Firefox maker’s relationship with Google has become “more complicated” since the company launched its own browser.

Mozilla is dependent on Google for the vast majority of its revenue and has previously worked closely with the search king’s engineers on the development of Firefox.

But that relationship appears to have cooled since Google released Chrome in the summer. “We have a fine and reasonable relationship,” John Lilly, Mozilla’s CEO, said in an interview with Computerworld. “But I’d be lying if I said that things weren’t more complicated than they used to be.”

Following closely behind the mid-November 2.06 release of VirtualBox, Sun Microsystems has released version 2.1. This has a number of new features, but one of the most interesting is the ability to run a 64-bit VM inside a 32-bit host. Another useful feature is integrated host-based networking; no more fiddling around with network bridges. Sun is really giving VMWare a run for their money.

A trio of Massachusetts Institute of Technology students who found a way to hack into the Boston subway system’s payment cards have agreed to partner with transit officials there to make the system more secure.

The Electronic Frontier Foundation announced the agreement Monday, two months after the Massachusetts Bay Transportation Authority dropped a lawsuit against the students, who were represented for free by the EFF, a civil-liberties group that frequently takes up cases involving security researchers and computer hackers.