// delete_footnotes.jsx  
//  
var myDoc=app.documents[0];  
 
for (oneStory=0; oneStory<myDoc.stories.length; oneStory++){  
    var myFootnotes=myDoc.stories[oneStory].footnotes;  
    for (oneFN=myFootnotes.length-1; oneFN>=0; oneFN--){  
        myDoc.stories[oneStory].footnotes[oneFN].remove();  
    }  
} 

myDoc.stories[oneStory].footnotes[oneFN].remove(); 

myDoc.stories[oneStory].footnotes[oneFN].convertToText(); 

app.activeDocument.stories.everyItem().footnotes.everyItem().remove();