Rated 2 out of 5 stars

Can you please fix this theme for Mac OS?

This review is for a previous version of the add-on (0.1.2). 

No, I can't. The original classic Mozilla Suite theme was intended for Mac OS 9 with its Platinum theme and for Mac OS X original Aqua theme, with its pinstripes and bubbly buttons. It won't look good at all on modern macOS. Just like it looks horrible with Windows 10 default theme.