Removing the Huffington Post Customizations results in a standard edition of Firefox. If that is your preference, click on the "Go to Mozilla.org" button. If you want Huffington Post Customizations, click close and re-check the box before continuing with installation.

Great news, you're already on the latest version of Firefox

You can customize Firefox by adding the Huffington Post Toolbar, or go directly to HuffingtonPost.com
Customize with a Huffington Post Toolbar
 
Go to HuffingtonPost.com