I'm not sure what version of Firefox this started with, but double clicking to open account specific settings no longer works.
If you right-click the account and then click 'Settings' it still opens, so isn't a show stopper, but because of the translucency of the context menus, it is pretty annoying...
Eric? Haven't heard from you in a very long time, I hope you're ok, not the end of the world if you don't have time to take a look, but if you do, that would be great.
Best regards,
Charles
