Yeah, it should be easy to make it a Chrome extension, I just don't know anything about them. The code is two JS files, and some stuff that Apple uses to let it auto update.
I don't actually know JS, so I had to change around another extensions code for this. The code itself is probably pretty cluttered and unnecessary, but it works just fine.
There is one problem with it though. It replaces anything on MPGH (.net and .me) that have a continuous string of characters that match what I told it to look for, so Sam, same, sample, and SAM (surface to air missile) all get changed to King Spam Faggot. So, "I'm the same way," gets changed to "I'm the King Spam Faggote way"
Replace >name< or ]name< with >oldname< or ]oldname<, I'm pretty sure the names are always in their own tags or next to [MPGH] and the end tag
Or just find out where the names appear and replace the specific locations