That's being caused by this block of code on the page. It's including the very old Facebook Javascript library and you'll need to disable the inclusion for the new Facebook Javascript library to function, which is necessary for authentication:2. Test: Facebook Javascript library inclusion
Fail: Another Facebook extension is installed, including the Facebook Javascript library, and may conflict.
<script type="text/javascript">
// <![CDATA[
(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) {return;}
js = d.createElement(s); js.id = id;
js.src = "https://connect.facebook.net/fr_FR/all.js#xfbml=1&appId=118897782028807";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
//]]>
</script>
<div id="main_fbcommentsM124" class="main_fbcomments main_fbcomments_below" >
</div>
<div id="main_fbcommentsM124_temp" class="main_fbcomments_temp" style="display: none;"></div>
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