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I do not really understand your question. The "ext" folder is a featue of the Java RT. Its use has nothing to do with JavaFX in particular. It does not make a difference if you use jars from there in a Swing or in a JavaFX program.
In the discussions you have mentioned it was suggested to move the JavaFX RT from the location where it currently resides to the "ext" folder, so that it will be automatically included in the classpath. But this is an open discussion and should not be relevant for you if you want to place your own libraries in the "ext" folder.