AdaptiveBlue, developer of the Firefox add-on BlueOrganizer, announced that it raised $4.5 million in second-round financing to continue developing semantic-based browsing tools. Union Square Ventures and Biltmore Ventures contributed to the round.

The BlueOrganizer links users to content based on their previous web searches and browsing habits. The Livingston, N.J. company’s secondary product, SmartLinks, is a plugin that adds shortcuts and context to blogs and social network sites.

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