Diễn đàn hỗ trợ Firefox

I am sick and tired of Firefox denying me access to common store websites. How do I turn off your firewall? I want to shop on Lowes.com and I cannot get access. Firefox is proving recently to be more of a problem than an asset.

I've posted before but no answer as to why Firefox labels Paypal as an unsafe site. I don't know where to change settings to allow it without the warning. I've just ignored the warning and continued but it is annoying.