Just because the client-side application's source code is readable in a text editor it doesn't mean it's easier to skin than a binary blob who's theming support

Just because the client-side application's source code is readable in a text editor it doesn't mean it's easier to skin than a binary blob who's theming support is documented. Not to mention how your method could break tomorrow without warning because Facebook (or whatever you're skinning) push out an update that's incompatible with the theme you've hacked on to it.