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Step 1
Open the "View" menu in Firefox.
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Step 2
Scroll down to "Text Size." This opens a submenu where you can increase or decrease your browser's default font size. There's also a "Normal" option, which will take the screen fonts back to their original size.
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Step 3
Add "Increase," "Decrease" and "Normal" font size buttons to your toolbar by browsing to the Mozilla add-ons page.
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Step 4
Search for and download "Text Size Toolbar." This add-on will place three buttons onto your Firefox toolbar that mimic the buttons in the View menu.








