Hash Tag Appended to Url in Firefox and Chrome

Recently working on a project we had a issue where a strange hash tag was being appended onto the url of the site as shown in the example below.

http://www.domain.com/product#.T-1kH7XY9Zs.

After some short problem solving and disabling various scripts on the page I found my cause of this problem was an add this script that was added to the footer.

In the script was this line of code: 

<script type="text/javascript">    var addthis_config = { "data_track_addressbar": true };</script>.

To solve the problem I simply changed true to false.