Visited a secure site, but found no indication on FIREFOX that site was secure (e.g.: No padlock displayed) so switched to internet explorer to continue....
Visited a secure site to renew my membership, but there was no indication on FIREFOX WINDOW that the site was secure. Whereas, when using Internet Explorer the usual padlock symbol was displayed.
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The padlock has been replaced by the site identity button, for details on using it see https://support.mozilla.com/kb/Site+Identity+Button
If you want to add a padlock icon to the location bar, you can use the Padlock add-on - https://addons.mozilla.org/firefox/addon/padlock-icon/