<toolbarbutton
    class="toolbarbutton-1 chromeclass-toolbar-additional"/>

<toolbarbutton
    class="toolbarbutton-1 chromeclass-toolbar-additional"
    class="autocomplete-textbox-container"/>

//get the area where the toolbars will move to
var a = document.getElementById("content");
var b = document.getAnonymousElementByAttribute(a, "class", "tabbrowser-tabs");
var c = document.getAnonymousElementByAttribute(b, "class", "tabs-stack");
var d = c.childNodes[1].firstChild.lastChild;

if (document.getElementById("tm-newtab")) {
    var e = c.childNodes[1].firstChild.firstChild.childNodes[1];
    // preparations for the new-tab button and the toolbar
    var z = document.createElement("hbox");
    if (true) gPrefService.setBoolPref("extensions.tabmix.newTabButton", true); //show the new-tab button box
    e.insertBefore(z, e.firstChild);
    if (true) e.lastChild.setAttribute("style", "display:none !important;"); //hide the new-tab button
    z.insertBefore(e.lastChild, z.firstChild);
    var y = z.firstChild; //set the left point where the toolbar will move to
} else {
    var y = c.childNodes[1].firstChild.firstChild.firstChild; //set the left point where the toolbar will move to
}

//move the toolbar to the left
var n = document.getElementById("###Toolbar's id###");
n.setAttribute("style","border:0px;padding:0px;margin:0px;-moz-appearance:none");
n.setAttribute("iconsize","small");
y.parentNode.insertBefore(n, y.nextSibling);

//move the toolbar to the right
var m = document.getElementById("###Toolbar's id###");
m.setAttribute("style","border:0px;padding:0px;margin:0px;-moz-appearance:none");
m.setAttribute("iconsize","small");
d.parentNode.insertBefore(m, d.nextSibling);

<toolbarbutton
    class="toolbarbutton-1 chromeclass-toolbar-additional"/>