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function n(e) {
    var o = document.createElement("a");
    if (o.href = e,
        "chrome.google.com" == o.host) {
        var n = o.pathname;
        "/" == n.slice(-1) && (n = n.slice(0, -1));
        var t = n.split("/");
        return t.pop()
    }
}

function t(e) {
    var o = "https://clients2.google.com/service/update2/crx?response=redirect&prodversion=49.0&x=id%3D***%26installsource%3Dondemand%26uc"
    , n = "***";
    return o.replace(n, e)
}

function get_crx_url(url) {
    return t(n(url));
}

//example
//download Save to Pocket
get_crx_url("https://chrome.google.com/webstore/detail/save-to-pocket/niloccemoadcdkdjlinkgdfekeahmflj");