Safari extension is no longer supported
Author: tempusthalesCreated Mar 17, 2022Updated May 8, 2025
The format that you supplied the safari extension in, is no longer supported by Apple. When you double click to install it the following error appears:
Safari no longer supports this extension.
You can find new and updated extensions in the App Store or from developers’ websites.
But one can't find the plugin in the App Store.
Source: adam-p/markdown-here