Please add a toggle switch for the add-on, and a check box to enable or disable the add-on on a site by site basis .

Please also add Awami Nastaliq with graphite features. And make it customizable through this add-on.

Changa should not be the default font because it might deter some people away. Of the available fonts, Nastaleeq3, Sherazde and a few others are same or similar as those generally used in Urdu newspapers; so the default selection should be one of them.

The interface is really easy to grasp though and the default font size (130%) and line-height (180%) are both perfect.

May Allah Ta'ala reward the developer for his efforts.

On most websites: FontType won't change, but spacing & size do

On YouTube, WhatsApp: No effect.

Thats one of the kind extension. Thanks for that.
Try adding more fonts, and remove some.
good effort (Y)