SD has reported it and requested a re-scan of their site. Looks like Mozilla is utilizing this particular Google service as a security measure. Seems a little ham-fisted in that entire, perfectly legitimate, sites get blocked because of something being planted by a bad guy somewhere on the site. I like the idea in theory from a security perspective, there just needs to be a better way to remedy the problem once it occurs.
And a link to 'Ignore this warning' is not a good solution, IMO.