Adding programs to pen window ie firefox

Actually... nope. That program won't do what the OP wants, it just lets you summon the pen window launcher wihtout the S-Pen itself.

As for adding programs to it, initially you only have a handful because that's built into each app's code (using Samsung's SDK), but still the same dev from the above app has this solution:
https://forums.androidcentral.com/e...i.xperiacle.multiwindow.enable&token=fXtxQpA_

For FULL access to all apps you need root, but this will let you add quite a bunch that are not usually available.
 

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