Customizing Firefox for Use in Windows 8.1
Using any convenient browser (even the tiled version of IE), go to the Firefox website and follow the instructions to download and run the installer for the latest version of Firefox.
Depending on how you install Firefox, the first time you run it, you may be asked whether you want to import bookmarks from Internet Explorer. You may also be asked whether you want to make Firefox your default browser.
Firefox is a little different from IE in that it has a search bar in addition to the address bar. In fact, you can type search terms into the address bar or the search bar, and Firefox brings up your preferred search engine to look for them.
Setting a home page in Firefox is similar to setting one in IE. To get to the right place, click the Firefox menu (in the upper-left corner), choose Options, and then Options again. Home page settings are on the General tab.