Help adding this functionality to Firefox

[Noitidart]

Hi there,
I was trying to add this exact same functionality to a Firefox addon. I posted a topic on Stackoverflow I was wondering if you could help please -

http://stackoverflow.com/questions/36075213/inject-code-to-other-applications-replicate-simbl-and-afloat-behavior-with-coc

[Noitidart]

Update - i created a global hotkey, and whichever window is currently focused is set to always on top. I got windows and linux support for hotkey and always on top - https://addons.mozilla.org/en-US/firefox/addon/topick/

I got the mac global hotkey working, but I can't figure out the always on top for a window not owned by the calling process. Firefox addon is the calling process.