Today, I'll show you how to change your default language on Mozilla Firefox which is pretty easy too. You can also have a list of languages in order of preference. This guide is for Firefox on Windows, search my website for this guide on other operating systems. 1. Open Firefox and click the Menu hamburger top-right, then choose Options 2. On the left-side window pane, make sure General is selected, then scroll to Language and … [Read more...] about Change browser language in Mozilla Firefox on Windows