It's been less than three years since Gary Kovacs came on as CEO of Mozilla and the former Adobe exec is already planning his next venture, which he says will be more commercial in nature. Later this year Kovacs will officially step down as CEO, though he will remain on the board of directors. Under his tenure, Firefox has held its own in a rapidly changing browser market while making strong moves in the mobile space: first, launching a mobile browser, then a whole mobile OS all its own. Now the company is working closely with Samsung to build a rendering engine designed from the ground up for mobile and ARM, called Servo. The search is now on for a replacement for Kovacs who will continue in the chief executive role until later this year. Whoever steps into those shoes still has a lot of work to do. While Kovacs may have helped guide the company through some rough waters to remain relevant, there are still stiff challenges ahead. Skip on past the break to read the announcement sent to employees this morning.