Google officials confirmed news of long-rumored plans to offer its own Web browsing software, entitled Google Chrome, in a company blog post after it mistakenly mailed details of the plan to a Google-watching blog, called Blogoscoped.com.

The company statement calls the move "a fresh take on the browser" and said it will be introducing a public trial of the Web browser for Microsoft Corp Windows users on Tuesday. Details can be found at tinyurl.com/gchrome/.

The Internet search leader is also working on versions for Apple Macintosh users and for Linux devices, it said.

The launch of Chrome coincides with the recent introduction by arch-rival Microsoft of its Internet Explorer 8 last month. Internet Explorer holds roughly three-quarters of the browser market, followed by Mozilla's Firefox and Apple Inc's Safari browsers.

Google said its engineers have borrowed from a variety of other open-source projects, including Apple's WebKit and the Mozilla Firefox open-source browser. As a result, Google plans to make all of Chrome software code open to other developers to enhance and expand, the company said.

"We realized that the Web had evolved from mainly simple text pages to rich, interactive applications and that we needed to completely rethink the browser," Google Vice President of Product Management Sindar Pichai and Engineering Director Linus Upson said in a jointly authored blog post.

BUILT FOR SPEED

They said Google Chrome promises to load pages faster and more securely, but it also includes a new engine for loading interactive JavaScript code, dubbed V8, that is designed to run the next generation of not-yet-invented Web applications.

"What we really needed was not just a browser, but also a modern platform for web pages and applications, and that's what we set out to build," Pichai and Upson wrote.

A Google spokesman declined to comment beyond the blog post.

Microsoft said the recently upgraded version 8 of Internet Explorer offered many new privacy and user control features.

"The browser landscape is highly competitive," Dean Hachamovitch, general manager of Microsoft's Internet Explorer, said in a statement.

"People will choose Internet Explorer 8 for the way it puts the services they want right at their fingertips, respects their personal choices about how they want to browse and, more than any other browsing technology, (it) puts them in control of their personal data online," Hachamovitch said.

John Lilly, chief executive of Mozilla Corp, the organization behind the Firefox browser, said Google, which has been his non-profit organization's biggest financial backer for several years, had recently renewed its support through 2011.

Mozilla recently introduced its own upgraded browser, Firefox 3, and has collaborated with Google on a variety of technical issues, including a system for reporting software crashes and to make software browsers more secure.

He said in a blog post that Mozilla and Google would continue to collaborate where it made sense for both organizations, but that Mozilla would also focus on its main mission of keeping the Web open and participatory by fostering its own commmunity-developed browser and other projects.

"With IE, Firefox, Safari, Opera, etc -- there's been competition for a while now, and this increases that," Lilly wrote in commenting on news of Google Chrome.

GOING 'INCOGNITO'

Google confirmed that it had prematurely mailed a copy of a promotional comic book detailing plans for Chrome to a blogger. Blogoscope's writer, Philipp Lenssen, scanned and published the 38-page comic here

Chrome organizes information into tabbed pages. Web programs can be launched in their own dedicated windows. It also offers a variety of features to make the browser more stable and secure, according to the comic book guide.

Among Chrome's features is a special privacy mode that lets users create an "incognito" window where "nothing that occurs in that window is ever logged on your computer." This is a read-only feature with access to one's bookmarks of favorite sites.