Although Windows comes with a perfectly functional Web browser of its own, many users prefer Mozilla's Firefox. Firefox has an unusually rich ecosystem of add-ons and extensions, and it has a long history of offering good performance with minimal security issues. All you'll need in order to download and install it is an Internet connection and an existing browser.
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Downloading and Installing
Use your existing browser to go to Mozilla's download page (see link in references). You'll see a large version of the Firefox logo superimposed on a colorful button labelled "Free Download." Depending on the speed of your connection, the download might take as little as a few seconds or as long as a minute or two. When it's finished, a dialog box will open and prompt you to run the setup file. Click "Run" and follow the onscreen prompts to finish the installation. You'll see a new Firefox tile on your Start screen, and when you're in Desktop mode you'll see a Firefox icon on your taskbar.
These instructions are valid for Windows 8.1 and Firefox 30. The installation process might vary in future versions of the programs.