I am unable to get appearance themes to preview themselves on my browser before I add them anymore how do I get them to do that again?

I think I removed something from my computer when I was cleaning it up and I guess I removed the thing that allowed Themes to preview themselves on my browser when I put my mouse over them or maybe its something that is blocking them.

Previewing a lightweight theme (Persona) only works on sites that are white-listed via an allow exception, so make sure to have an allow exception for the addons.mozilla.org domain.
You can see the permissions for the domain in the current tab in:
* Tools > Page Info > Permissions > [X] Install Extensions or Themes
* Tools > Options > Security : "Warn me when sites try to install add-ons": Exceptions
Make sure that you do not use <i>Clear (Recent) History</i> to clear the "Site Preferences".
* https://support.mozilla.org/kb/Clear+Recent+History
* http://kb.mozillazine.org/Themes#Lightweight_theme

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