Mountain View, Calif. — RockMelt, a social web browser startup company, said on Wednesday that it has raised an extra $30 million in a new round of funding.

Accel Partners, Andreessen Horowitz, Khosla Ventures, Ron Conway, Josh Kopelman and Bill Campbell participated in the series B funding round. This brings RockMelt’s total funding to $39.9 million. Vinod Khosla and Jim Breyer of Accel plan to join the board as observers.

The company was first launched in November 2010 as a private beta version and is now offering a free public beta version to its users. Powered by Chromium speed, RockMelt has received a lot of media attention but not a significant number of users.

In an interview with TechCrunch, CEO Eric Vishria said the company planned to grow by leveraging its deeper user engagement. “In the next couple of months we will shift to grow the number of users in a serious way,” he told TechCrunch.

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