Flock, the Mozilla-based "social web browser," which we've profiled in the past here and here, has just announced its new Eco-edition browser just in time for Earth Day. This "green" version of the browser sports a new theme and comes pre-loaded with content that eco-minded folks will enjoy.

The most noticeable difference between the Eco-edition of Flock and the standard edition is the new green theme. Instead of blue, the background and browser buttons are now green, which is a nice change of pace for regular Flock users, who have probably been checking the "Themes" page for a while now to no avail.

Eco-Edition

However, what really makes this…