Mozilla has released a new Universal version of Firefox that adds native support for Mac OS X running on Intel processors, and also contains important security fixes for all Firefox users.

The new version of the browser, Firefox is described as a "stability and security" release by the Mozilla team, addressing critical security problems as well as a number of other bugs.

"We're identifying this as a critical release and we're strongly recommending that everyone update as soon as possible," Mozilla said.

Software updates should be delivered automatically to Firefox 1.5 users in the next few days, but those using earlier versions of the browser will need to manually update their browser.

With the improved Mac OS support, Firefox now will be able to take advantage of performance enhancements in the chipsets used by Apple's new Intel-based Macs, which were introduced earlier this year.

This should speed up web browsing on these new systems, which had previously relied on Apple's Rosetta translation technology to run Firefox.

Mozilla did not provide details on the security problems addressed by the update, but those are expected to be added to the project's security vulnerabilities page.