Microsoft rivals Google, Mozilla, and Opera are seeking last-minute changes to its proposed settlement with European regulators that would give buyers of computers loaded with Windows 7 ability to choose a default browser other than company’s Internet Explorer — aim to ensure that Microsoft doesn’t unfairly influence decision, said Hakon Wium Lie. “We hope commission is open to fixing the remedy,” Mr. Lie said. “We feel it is very important that this remedy works. It is a once-in-a-lifetime opportunity to make sure there is a working market for browsers. I don’t think we are going to get another chance.” An antitrust lawyer in Brussels said request for changes could prompt commission to seek further concessions from Microsoft. IE has a 67% share of global browser market, according to Net Applications, a research firm in Aliso Viejo, California. Firefox has 24%, Apple’s Safari, 4.4%, Google’s Chrome, 3.5%, and Opera, 2%.