Summarize this article in one sentence.
Double-click the shortcut icon on your desktop to launch the browser. The Menu button is on the upper-right corner of the screen. For older versions of Firefox, click on Tools on the menu toolbar on the upper part of the window. " This will bring up the "Options" window. " Here you'll find different options for changing how fonts are displayed on the browser. This will show a list of fonts you can choose from. Just scroll down and select the font you want. If you want to change fonts for all websites, proceed to the next part. Just click on "Okay."

Summary:
Open Mozilla Firefox. Click on the "Menu" button. Select "Options. Click "Content. Click on the "Default Font" drop-down box. Save changes.