I assume they'll mine the logs for URLs (and prioritise by the number of reports and prominence of the site) and mine the comment section for common phrases such as "login" to see if there are widespread problems affecting multiple sites. (I'm guessing it also passes on other useful info like platform and version that you don't need to type in). They're the type of org where you could probably find out exactly what they do with these reports.

Since Firefox devs actually post here, you'd have a good chance of getting interest (though perhaps a more informative title on the submission would have helped that).