FireFox 手动安装下载的xpi文件（extensions）

<SCRIPT language="JavaScript">
function install(); {
    var xpiname = document.instl.xpiname.value;
    var xpi = document.instl.xpi.value;
    if (xpiname != "" && xpi != ""); {
        xpi = xpi.replace(/\\/g, "/");;
        xpi = "file:///" + xpi;
        eval("InstallTrigger.install({'" + xpiname + "':'" + xpi + "'});;");;
    } else {
        return false;
    }
}
</SCRIPT>