I just saw this thread and I already tried it.
It's quite good for me, but I do have some suggestion:

1. Upon adding Merit/s to a post it would also automatically refresh the page so I can already see that I gave the post some Merits and no need to refresh it.
2. When refreshing the page it comes back to it's original theme until it loads back to the script. I just want to be it like this :
https://chrome.google.com/webstore/detail/dark-theme-for-facebook/fkfobiagdiioemjmpdecklcjaplpljdo
(When you apply it on facebook and refresh a page, it doesn't show the white colors before it shows the theme.)

Edit:
3. Enhanced Report To Moderator UI (It will show on the User's Post History)