Microsoft is reportedly planning to use a new browser dubbed as "Spartan" for its Windows 10, instead of Internet Explorer.

The new browser will resemble a sleek, modern combination of Chrome and Firefox. Spartan will still use Microsoft's Chakra JavaScript engine and Trident rendering engine, according to ZDNet. Unlike Internet Explorer, the new browser will support extensions, and will be available for both desktop, tablets and mobile units running on Windows 10.

The report coincides with an earlier tweet by Thomas Nigro, Microsoft's Student Partner lead, which read: "Ok so Microsoft is about to launch a new browser that's not Internet Explorer and will be the default browser in Windows 10. Wow."

But Spartan is just a codename for the new browser; sources added that Microsoft might release it with a different name as it tries to steer away from the negative feedback of users on the older version of IE.

If the sources' information is accurate, Spartan will debut on Jan. 21 along with Windows 10 at least for the desktop version in an event in Redmond, Washington. Its mobile version will not be available for testing until early 2015.

ZDNet's Mary Jo Foley reiterated several times in the report that Spartan isn't IE.

Mashable asked a Microsoft spokesperson for comments about the news, but the company said there is "nothing to share."