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How do you change the tab colour on published modules
Do You mean in joomla panel to show the list of published modules with a different color? It depends what admin template is used. I'm afraid there are no classes in html to attache such styling.
I am using the socialise theme
JomSocial is the most complete, easy-to-use addon that turns Joomla CMS into a full -fledged, social networking site