The company that developed the popular web browser Firefox is the Mozilla Corporation. Mozilla was founded in 1998, focusing on promoting an open-source web and user privacy. Firefox was launched in 2002 as a response to browsing issues with existing browsers, aiming to provide users with a faster, safer, and more customizable browsing experience. Today, Firefox continues to be a significant player in the web browser market, emphasizing user control, transparency, and a commitment to web standards.