Andreessen is investing in a start-up called although few details are yet available about the browser it is developing.
The company is co-founded by Eric Vishria and Tim Howes. They had previously worked at a company called Opsware, which was co-founded by Andreessen and sold to HP.
A report in the New York Times says that the browser will be tailored to work closely with Facebook, allowing users to see updates from the site while browsing the web. However, the report also states that Facebook said it was not working with RockMelt.
Andreessen sits on the board of Facebook, as well as being co-founder and chairman of social networking site Ning and running a $300m technology fund with business partner Ben Horowitz.
For many people, Netscape was the first browser via which they explored the World Wide Web. It eventually succumbed to the popularity of Microsoft Explorer, but was built on the Mozilla source code, which is behind Mozilla Firefox.
Google is also muscling in on the browser market with its Chrome offering. In spite of impressing users, it has failed to take a large share of the market from Internet Explorer, unlike Mozilla Firefox, which has the advantage of being compatible with PCs and Macs.
According to figures published by NetApplications, Internet Explorer has a 67.7% market share, against 22.5% for Firefox, 4.1% for Mac-only Safari and 2.6% for Chrome.