Firefox Unsecured Link Warnings

I hate to throw up problems in entering a comp or using a site, but are all Firefox users tearing their hair out at the minute as I am? They've started flagging up a good proportion of web links as unsecured, and making you consciously indicate that you are going ahead and accepting the risk. I had pop-ups/alarms and general mayhem on Sunday when I clicked on a Facebook trending story, along with the message that a virus had been inserted, only to find that two independent checks showed no virus and no threats at all.

Just now I've completed Chat Magazine Issue 12, clicked "Yes. I want to submit my answers" rather than the alternative "Cancel", only to be faced with the empty form with no answers that I started with - nothing to say my entry is accepted, and I've repeated the form in case I'd pressed the cancel button in error.

Same result!!

Just wonder what other Firefox users think?

PS I've copied much the same point on the Chat comp. thread.