This is normally present on many websites, and should not be a major concern to you. Normally you want to click yes to continue.

If you are on a suspicious website, or one which you don't trust, be careful not to enter credit card information if that message appears. Only enter credit card information on fully secure websites.

I want to stop that message.

Yes please provide a way to disable this message. It is absolutely ridiculous that you can't turn this off. I understand trying to keep the sheep safe, but at least give us a technical workaround for those that are stuck with poorly designed websites that we have to use everyday. I have users that 60+ years old, any popup at all and they freak out. I have set all security warnings in about:config to false yet I still get this message. If you aren't going to provide a way to disable it, then give me a trusted site list where I can add sites I know are good. This gives us the best of both worlds. You can still play herder for the sheep and websites that we know are good and have to access we can add to the trusted sites list. Honestly, this is a regression in functionality. Firefox used to be good.

This feature is intentionally designed to not be turned off, as it protects people from scams like 'Firesheep' and 'Blacksheep'. It can be frustrating to run into the error repeatedly, and the way to avoid it is to not go from a secure connection to one that is not secure. There are tips such as going directly to a login page, instead of the home page for some websites.

when it ask if i want to continue and i click on it nothing happens have run virus check