// ==UserScript==
// @name        Change theme-color
// @include *://github.com/*
// @grant   none
// @run-at  document-start
// ==/UserScript==

var meta = document.getElementsByTagName('meta');
var i;
for (i=0; i<metas.length; i++) {
    if (meta[i].name == "theme-color") {
        meta[i].content = "#1e2327";
        }
    }
document.getElementsByTagName('body')[0].addEventListener("gesturestart", gestureStart, false);

(function gestureStart() {
    for (i=0; i<meta.length; i++) {
        if (meta[i].name == "theme-color") {
            meta[i].content = "#ffffff";
        }
    }
})();