Can't pin an extension to the toolbar

I have Bitdefender SecurePass Installed, enabled and populated but I can't put an icon for it on my toolbar or, apparently, actually activate it in any other way. Bitdefender suggests there is a bug in Firefox causing this. They suggested that setting Firefox to save history should fix it but it didn't. They also suggested that working in incognito mode might be the problem. I have tried turning off incognito mode and this still has not solved my problem.

When I originally set up SecurePass, it worked fine - the logo icon appeared on the toolbar and it activated when required. I then had a problem with getting multiple popups that purported to be warnings from Firefox about viruses and trojans. I eventually had to completely uninstall and then reinstall Firefox in order to get rid of the popups and now I have this problem with being unable to actually use Bitdefender SecurePass.