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How to Change the Fonts in Mozilla Firefox Browser?
Open Firefox Browser.
Click the Firefox Button to Open the Menu and Click the "Options" item.
Click the "Content" tab at the Top of the Window.
Set a General Default Font Using the "Default font" Drop-Down Menu.
Select a Size from the Drop-Down Menu Next to the Font.
Click the "Advanced" Button in the Fonts & Colors Section to Further Customize your Settings.
The "Fonts for" Menu Lets You Specify Fonts for Different Languages, this is Set to your Operating System Language by Default.
The "Proportional," "Serif," "Sans-serif" and "MonoSpace" Fields let you Further Customize your Preferred Fonts and Sizes.
The "Minimum Font Size" Menu Lets You Select the Smallest Size Font you Want Displayed on a Page.
Uncheck the "Allow Pages to choose their Own Fonts" option if you don't want to use the fonts recommended by a certain page.
Click "OK" and Close the Firefox Settings window.
This is How You Can Change Fonts in Mozilla Firefox.