I like trains

// ==UserScript==
// @run-at document-start
// @name           General URL Cleaner OOP
// @namespace
// @description    Cleans URL's using OOP
// @include        *
// @version        1.0
// ==/UserScript==

// Clean the current page URL
var pageurl = modifyurl(document.URL);
if (pageurl != document.URL) location.replace(pageurl);

// Clean links on the page
var links = document.getElementsByTagName('a');
for (var i = 0; i < links.length; i++) {
    links[i].href = modifyurl(links[i].href);
}

// Generate new URL
function modifyurl(oldurl) {
    var newurl = oldurl;

    if (/^https?:\/\/(www|maps)\.google\.(.+?)\/(search|maps)\?/.test(oldurl)) {
        newurl = oldurl.replace("search?","search?&")
                       .replace(/\&(num|hl|safe|tbo|sclient|complete|as_qdr|um|sa|tab|authuser|rlz|cad|rct|ved|usg|site|source|oq|sa|ei|ie|dpr|gs\_l|ved|tbas|sei)\=[^&]*/g,"")
                       .replace("search?&","search?");
        if (/tbm\=isch/.test(oldurl) == false)
            newurl = newurl.replace(/\&bi(w|h)\=[^&]*/g,"");
    }

    else if (/^https?:\/\/www\.youtube\.com\/watch/.test(oldurl))
        newurl = "https://www.youtube.com/watch?" + oldurl.match(/v\=[^&]*/g);

    else if (/^https?:\/\/www\.ebay\.(.+?)\/itm/.test(oldurl))
        newurl = oldurl.match(/https?:\/\/(|www).ebay.(.+?)\/itm/g) + oldurl.match(/\/[0-9]{11,13}[^#?&\/]/g);

    else if (/^https?:\/\/www\.amazon\.*\/dp\//.test(oldurl))
        newurl = oldurl.match(/https?:\/\/(|www).amazon.(.+?)\//g) + oldurl.match(/dp\/[A-Z0-9]{10}/g);

    else if (/^http:\/\/www\.newegg\.(com|ca)\/Product\/Product\.aspx/.test(oldurl))
        newurl = oldurl.match(/http:\/\/www.newegg.(com|ca)\/Product\/Product\.aspx\?Item\=[^&]*/g);

    else if (/^http:\/\/www\.kqzyfj\.com\/click/.test(oldurl))
        newurl = decodeURIComponent(oldurl.replace(/http:\/\/www\.kqzyfj\.com\/click(.+?)\?url\=/g,""));

    else if (/http:\/\/stat\.dealtime\.com\/DealFrame\/DealFrame\.cmp\?/.test(oldurl))
        newurl = decodeURIComponent(oldurl.replace(/.*\&url\=/,"").replace(/(\%26|)\&linkin_id\=.*$/,"")).replace(/\&(url|partner)\=[^&]*/g,"");

    //else if (//.test(oldurl))
    //    newurl = oldurl.match(//);

    if (/((\?|\&|)utm_(source|medium|campaign)\=[^&\/]*|\&amp\;)/g.test(newurl))
        newurl = newurl.replace(/((\?|\&|)utm_(source|medium|campaign)\=[^&]*|\&amp\;)/g,"");

    return newurl;
}