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何らかの理由で、要素の値を引用符で囲まれたテキスト以外に設定できないようです。私が行くとすぐに:

hiddenField1.setAttribute("値", localStorage.curl);

または、ページの読み込みと属性の設定に失敗するだけです。

完全なコード:

var curl = localStorage["curl"];
var username = localStorage["username"];
var password = localStorage["password"];

function fakePost() {  
    var form = document.createElement("form");
    form.setAttribute("name", "form1");
    form.setAttribute("id", "form1");
    form.setAttribute("method", "post");
    form.setAttribute("action", "http://SNIPURLlogin&action=login");

        var hiddenField1 = document.createElement("input");
        hiddenField1.setAttribute("type", "hidden");
        hiddenField1.setAttribute("name", "short");
        hiddenField1.setAttribute("id", "short");
        hiddenField1.setAttribute("value", localStorage["curl"]);
        form.appendChild(hiddenField1);

        var hiddenField2 = document.createElement("input");
        hiddenField2.setAttribute("type", "hidden");
        hiddenField2.setAttribute("name", "txtUsername");
        hiddenField2.setAttribute("id", "txtUsername");
        hiddenField2.setAttribute("value", "shane");
        form.appendChild(hiddenField2);

        var hiddenField3 = document.createElement("input");
        hiddenField3.setAttribute("type", "hidden");
        hiddenField3.setAttribute("name", "txtPassword");
        hiddenField3.setAttribute("id", "txtPassword");
        hiddenField3.setAttribute("value", "shane");
        form.appendChild(hiddenField3);     

    document.body.appendChild(form);

    form.submit();
};
//minify function
fakePostCode = fakePost.toString().replace(/(\n|\t)/gm,'');

chrome.browserAction.onClicked.addListener(function (t) {
  chrome.tabs.create({"url" : "javascript:"+fakePostCode+"; fakePost();"});
});
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