In this tutorial, we learn how to make Firefox the default web browser. First, go to tools on your Firefox page and then click on options. Then, click on advanced and check that Firefox will be the start up browser. Click "ok" and then that window will disappear. You can now open up different windows and this will now make Firefox your default browser without having to change constantly with another browser. if you want to change this at any point, you can always go back to your advanced options and change it to not reflect Firefox as your default browser.