To check if it currently is the default browser, click on the ' Check Now' button, and if this isn't the case, Firefox will lets you confirm to allow it to set itself as the new default browser.
The next section of this tutorial explains how to use the standard Control Panel to set your default browser we'll start by showing you how to check, from within Firefox, if it currently is the default browser, and how to make the default web browser otherwise: Set or check that Firefox is currently the default browser
