如何停止在浏览器中打开的多个选项卡

我有一个Intent可以在Samsung平板电脑上的FireFox中打开网页，但每次都会保持打开新标签的状态.我一直在使用带有EXTRA_APPLICATION_ID的putExtra()，它以前曾做过花招，并使用相同的浏览器选项卡打开了页面，但现在它坏了.我不确定是否会有所不同，但是下面的代码是runOnUiThread()，因为还有其他处理会触及视图.任何想法将不胜感激.

I have an Intent that opens a web page in FireFox on a Samsung tablet but it keeps opening a new tab each time. I've been using the putExtra() with an EXTRA_APPLICATION_ID and it previously did the trick and opened the page reusing the same browser tab but now its broke. I'm not sure if it makes a difference but the code below is runOnUiThread() as there is other processing that touches views. Any ideas would be appreciated.

        String pageName = "http://google.com";

        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(pageName));
        intent.putExtra(Browser.EXTRA_APPLICATION_ID, getApplication().getPackageName());

        startActivity(intent);