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Step 1
Tools > Add-onsSelect "Tools" then "Add-ons" from the main web toolbar.
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Step 2
Select "Themes" from the Add-ons window.
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Step 3
Theme optionsSelect a theme from the options on the left. The "look" of it will display on the right. Click "Use Theme" on your selection.
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Step 4
Close the window by clicking on the "X" in the upper right-hand corner. The new Firefox theme will appear when you restart a new Firefox session.
















