why is a textarea getting added automatically to my content

[andyash]

<p>
<textarea id="adlesse_unifier_magic_element_id" style="display:none;"></textarea></p>

[Timbow]

Is it some redundant code left in a theme?

Or is it from your browser? [ http://adlesse.com/ ]
"Adlesse is a browser add-on that rids your web surfing experience of all the annoying animated ads enriching every webpage you visit with actually useful content instead..."

[andyash]

Is it some redundant code left in a theme?

Or is it from your browser? [ http://adlesse.com/ ]
"Adlesse is a browser add-on that rids your web surfing experience of all the annoying animated ads enriching every webpage you visit with actually useful content instead..."

Do you think Safari might be adding it and if so should I quit working on my sites in Safari?
EDIT: Just checked. Chrome is not adding this code so it might be Safari's issue only.