Welcome to the past! 👻
Unfortunately, FCKeditor is no longer maintained. RIP ❤️
Or, you can discover CKEditor 4, which is an enterprise-grade WYSIWYG editor with countless features and wide browser compatibility including the legacy ones.
Many new features: nested context menus, "maximize" and a few interface enhancements. Important bugs have been fixed, some of them regarding security issues. So, upgrade is highly recommended.