Browser status bar shows Transferring data from m.addthisedge.com
When I load a page that has the add this toolbar I see "transferring data from m.addthis.com" in the bottom right (Firefox 11) and it does not go away.
Is this something that should be of concern?
This could be because of your firewall
In your Addthis may contain facebook,twitter,g+,etc
one of them might be blocked by your system administrator / network engineer
Try to remove one by one and see which one is the culprit
and remove one that will resolve your issue
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