Adds a fixed header element for use by other scripts
Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://update.greasyfork.org/scripts/18233/187970/Window%20floating%20container.js
Scripts that import this library need to declare the three permissions required by this library.
