Sometimes when I save an articel or press "save and close" , I get the standart Firefox Popup that there's still unsaved Data and asking me if I really want to leave the page.
This usally gets triggerd with the window.onBeforeUnload() method but in K2 I could not find it. Can somebody tell me where to look in the K2 files or even has a fix for this problem?

Thank you!

The Save/Close options of K2 are based on the Joomla! API. Which Joomla! version do you use?

I am using Joomla! 3.1.5 Stable!

Please check all content plugins you are using or third party extensions that could cause a conflict with this.
Also let me know of the K2 version you are using.