It is fully open source, you can take it, alter it to your hearts content and share it again if you wish to. I made it because I wanted this feature on firefox as well but there were no alternatives, glad I could help others who also desired this feature.

Two indentical panels in retrospect, an unnecessary idea. My goal with that was, you can set a global change and still be able to individually alter certain pages, but I found zero uses for the global setting. I doubt other people has either. Perhaps I should remove it. Thank you for your review!