After six years, leaving Mike Beltzner Mozilla. He was previously with IBM and is currently the lead developer for Mozilla's Firefox browser. He leaves Mozilla but not immediately, but will finish the first release of Firefox 4 and conclude the development of Firefox 5 on the road.
Beltzner changed according to ReadWriteWeb and The Register Dug Software, a small software company that specializes in software for spatial modeling.
He believes that Mozilla will meet the challenges without him, Beltzner wrote in a journal. The actual development work had already made them.
Even after his official farewell, he will remain loyal Mozilla and Firefox and get involved in future in the Mozilla community.