The Mozilla Corporation announced tonight in a media alert that tomorrow it will be releasing an updated version of its Firefox web browser, which has sent for-profit rivals, including Microsoft, scurrying to hang onto market share.

Although Mozilla Corp says that official details of Firefox 1.5 will be released Tuesday morning, the media alert reported that the new software "builds upon the success of its predecessor to deliver an improved browser with significant performance and usability upgrades."

Enhancements were made to the browser's security, privacy, and customization options as well, the alert says.

The Mozilla Corporation is a subsidiary of the Mozilla foundation and is responsible for development and deployment of Mozilla products. The company reports that over 100 million users use Firefox, their flagship product.