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How to Adjust Browser Appearance in Mozilla Firefox?
Launch the Firefox Browser.
Select View Menu at the top of the Screen.
A Drop-down Menu Will Display Many Categories in which you can tweak your Browser's Appearance.
Click on Toolbars to decide which of the toolbars you want revealed within the browser window.
There is also the Customize option, which opens a small window that allows you to drag and drop items were you like.
Click Done to Save the Changes.
Now Go to “tools” tab and click on “Options”.
Go to Content Tab.
Here you can Change the Font, Size and Colors.
Click “ok” to apply the changes.
Now go to Tools Tab and Click On Add-ons.
Click on Get Add-ons Tab.
Scroll Down and Select Themes.
Select the theme of Your choice and Click add to Firefox.
This is How You Can Change the Browser Appearance of Firefox Browser.