How to Set Text Size in Firefox
Mozilla Firefox is a browser that you can easily configure to your personal tastes, both with visual styles like skins or "personas," and with various functional changes. Among these functional changes is the ability to adjust the text size of the Web pages you visit. You can adjust your text size on-the-fly and make it smaller or larger while viewing a page, or you can configure Firefox to ignore the text size settings on Web pages and always display the text in a size you've specified.
Instructions
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Open Firefox. Press and hold the "Ctrl" key and simultaneously press the "+" key to increase the size of the page text or the "-" key to reduce the size of the text. You can press the "+" and "-" keys repeatedly to increase or decrease the size.
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2
Click "Tools" from the top Firefox menu bar, then "Options." Click the "Content" tab and click "Advanced."
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Adjust the size of the proportional and monospace fonts with the drop-down "Size" menus next to each. Click the "Minimum Font Size" drop-down menu if you want Web page text to never be smaller than a specific size.
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Uncheck "Allow Pages to Choose Their Own Fonts, Instead of My Selections Above." This setting will force Firefox to use the proportional and monospace text sizes you have selected. Click "OK." Click "OK" to close the Options window.
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Tips & Warnings
When you change the font display size globally, you risk making some Web pages unreadable because they were designed to display text of a specific size. For general use, it is better to increase or decrease the size with the "+" and "-" keys on a page-by-page basis.