Insecure password warning?

Hi—Just today (though, to be fair, I haven’t been on the SDMB much lately) I started getting warnings from Firefox (Mac) that the SDMB pages are insecure. Specifically this warning.

Now, I went ahead and logged in anyway, security be damned! Gotta report this somehow. At any rate, what’s the scoop? Is this something that can be fixed?

This came up a few weeks ago http://boards.straightdope.com/sdmb/showthread.php?t=822212 The big picture is that nothing at the SDMB has changed; Firefox is just warning about how the SDMB has always been configured (more details in the thread that answered my question).