In this tutorial, you will learn how to change language in #Firefoxbrowser. Click on the three-line menu at the top right corner of Firefox. A drop-down menu will appear. Select "Settings". Make sure you are in the "General" settings in the sidebar. In the "Language" section, click on the "Choose" button. This will open a pop-up box. From the "Select a language to add" drop-down menu, select a language. Click on the "Add" button. Click OK. Close and re-open Firefox. This will apply your language