XKit 7.2.1 is now available for OS X Mavericks users. This update fixes the “DOM Exception 25” error that prevented users from using XKit on Safari 6.1 / 7.0.

To update, just go to the XKit download page and download it again.

If you encounter the error even after updating, try removing XKit from the Safari Preferences and try installing it again. If that doesn’t fix the problem, please send me an ask. Thank you!