try {
    CustomizableUI.createWidget({
        id: "ucf-paste-and-go",
        label: "Вставить и перейти",
        tooltiptext: "Перейти по адресу из буфера обмена",
        localized: false,
        defaultArea: CustomizableUI.AREA_NAVBAR,
        onCreated(btn) {
            btn.setAttribute("image", "data:image/svg+xml;charset=utf-8,<svg xmlns='http://www.w3.org/2000/svg' height='16' width='16' viewBox='0 0 48 48'><g><rect x='0' y='0' width='48' height='48' rx='3' ry='3' style='fill:rgb(0, 120, 173);'/><path style='fill:white;' d='M 19,3 C 18.5,3 18,3.5 18,4 V 9 H 30 V 4 C 30,3.5 29.6,3 29,3 M 18,15 V 30 L 12,29 C 11.5,29 11,29.1 11,29.5 11,29.9 11.5,30.5 11.5,30.5 L 23.5,44.7 C 23.9,45.1 24.1,45.1 24.5,44.7 L 36.5,30.5 C 36.5,30.5 37,29.9 37,29.5 37,29.1 36.5,29 36,29 L 30,30 V 15' /></g></svg>");
        },
        onCommand(e) {
            var win = e.view, url = "";
            try {
                let trans = Cc["@mozilla.org/widget/transferable;1"].createInstance(Ci.nsITransferable);
                let contxt = ("docShell" in win) ? win.docShell.QueryInterface(Ci.nsILoadContext) : win.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIWebNavigation).QueryInterface(Ci.nsILoadContext);
                trans.init(contxt);
                trans.addDataFlavor("text/unicode");
                let clipboard = Services.clipboard;
                clipboard.getData(trans, clipboard.kGlobalClipboard);
                let data = {};
                trans.getTransferData("text/unicode", data, {});
                if (data.value) {
                    data = data.value.QueryInterface(Ci.nsISupportsString);
                    url = data.data;
                }
            } catch (e) {}
            if (!url) return;
            win.gBrowser.selectedTab = win.gBrowser.addTrustedTab(url);
        }
    });
} catch(e) {}

onCommand(e) {
            var win = e.view, url = win.readFromClipboard();
            if (!url) return;
            win.gBrowser.selectedTab = win.gBrowser.addTrustedTab(url);
        }