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Step 1
From the top menu in Mozilla Firefox, go to "Tools > Options."
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Step 2
Choose the "Content" tab from the list of icons at the top of the "Options" box. From this tab, you can turn the pop-up blocker on or off, change how images load, enable or disable Java systems, change the default language, and change the default fonts Mozilla uses.
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Step 3
Click the arrow in the "Default Font" option and select from the drop-down bracket the font you wish to be displayed. Then choose the size of the font in the same way, from the box at the right.
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Step 4
Click "OK." Mozilla will load your preferred fonts and sizes into web pages.








