Manually you can create your own theme for Mozilla Firefox Browser by adding custom image to it, for that you need a ready made image you can make with any software application or can directly download and save it. Your image file should be of 3000 pixels x 200 pixels in either JPG or PNG format.
1. Install an extension Personas Plus
2. Once installed go to Tools > Add-ons
3. Choose Installed Addons from left side > Personas Plus > Option
4. Now upload your Header and Footer Image


You can choose various theme option along with your custom image or may go with the ready made themes available with it.

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