New Jersey-based AdaptiveBlue closed a $4.52 million second round funding, peHUB reports. The company’s backers include Union Square Ventures and Biltmore Ventures. The semantic web startup’s leading product is a “smart browsing” technology called BlueOrganizer, a Firefox plugin that helps users organize shortcuts to webpages via widgets. The company raised an undisclosed first round in Feb. 2007.

• AdaptiveBlue Raises First Round Funding for Firefox Plug-In