unfix position

dft-position-unfixed.js

// ==UserScript==
// @id             dft-postion-unfixed
// @name           Remove position fixed
// @version        2.0
// @namespace      dft
// @author         Matthew Goodall
// @description    Changes position:fixed to position:static
// @include        *
// @exclude        https://docs.google.com/*
// @run-at         document-end
// ==/UserScript==

// remove position fixed from an element
function unfix(element){
    if (window.getComputedStyle(element).position == 'fixed'){
        element.style.position = 'static';
    }
}

// remove position fixed from an element and its children
function unfixRecursive(element){
    var i, child;
    if(element.childNodes){
        for(i=0; i < element.childNodes.length; i++){
            child = element.childNodes[0];
            window.setTimeout(unfixRecursive,0,child); // allow the function to exit earlier
        }
    }
    unfix(element);
}


// Set up an observer to remove position:fixed from elements when they are changed/added
var observer = MutationObserver(function(records){
    var i,j,records, element;

    for (i = 0; i < records.length; i++){
        record = records[i];
        if(record.type == 'childList'){
            if (record.addedNodes){
                for(j = 0; j < record.addedNodes.length; j++){
                    element = record.addedNodes[j];     
                    unfixRecursive(element);
                }
            }            
        } else if (record.type === 'attribute') {
            unfix(record.target);
        }
    }
});

// register the observer
// note: this will fire at least once because the body will get a childList modification
observer.observe(document.getElementsByTagName('body')[0],
                 {attributes: true,
                  subtree: true,
                  childList: true,
                  attributeFilter: ['style']});