Anyway, Royal Cap brother, this extension of yours will be more useful when other people's posts characters won't be count I mean including and inside the "quote".
For example, it is already showing 1127 characters even I didn't put a single character.
Isn't that the tricky part? If it were an individual comment it should work just fine. But when we are talking about multiple quote/mentions with complex bbcodes that's just one hell of a messy subject. It would be hard for the userscript to separate those two.

Alright, it could be tricky part but may be not impossible.
However, I learned about nested loops a long time ago, so perhaps using something like this in the case of nested quotes can eliminate the issue of multiple quotes. Maybe we need to make the script a little more complicated for this. I messed around with this on chatgpt yesterday but couldn't solve the problem. I guess I didn't give the correct prompt.
