Removes the firefox issue link.

unsupported_browser.html

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-    <div class="firefox">We are hoping that <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=977864">multistream support</a> for Firefox would not be long so that we could all use this application with our favorite browser.</div>
+    <div class="firefox">We are hoping that multistream support for Firefox would not be long so that we could all use this application with our favorite browser.</div>
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