two things here I see
1. what do you mean why would you want to remove classifieds from your vb
menu that seems kinda backwards. You can disable any vb
plugin you wish under your plugin manager
2. if your referring to say the tinymce editor that is external software. You can try the various options like advanced basic and off and see which resolves your issue this is exactly why there is a switch to turn this off. Since this is external software we do not directly support that it would work in every browser setup.