Oh, thanks! I hadn’t seen that before.
EDIT: Wow, that’s a great tool. Narrowed it down very quickly to unofficial plugins, then the Babble plugin, then specifically the full page chat option.
@gdpelican your plugin controls are not working as expected. Un-checking “Enable Babble shoutbox plugin” does not seem to globally disable the plugin, I had to also uncheck the full-page chat option box.