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Firefox 4: dynamically open window opens new tabs in the old window (i.e. window.opener)

This seems like a strange change of functionality with Firefox 4. After opening a window using window.open () when clicking links in the window that opens using the middle mouse button (or right-clicking and selecting “open in a new window” tab), it opens Links in a new tab in the old window .

In Firefox 3, the tab would open in a new window.

Sample code, index.html:

<html>
    <head>
        <script type="text/javascript">
            function foo() {
                var w = window.open('page2.html', 'foobar', 'target=_blank');
            }
        </script>
    </head>
    <body>
        <a href="#" onclick="foo()">bar</a>
    </body>
</html>

page2.html:

<html>
    <head />
    <body>
        <a href="www.google.com">google</a>
    </body>
</html>

After opening page2 from index.html and right-clicking on the google link in the window containing index.html, a new tab will appear.

Does anyone know how to fix this?

EDIT: Chrome does the same.

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