Autofill won't make a rule for this page

I’m posting here since the web page for the add-on, www.tohodo.com, appears dead (gives a blank page).

I use Autofill in Firefox to remember logins that Password Manager won’t, and on most pages it works OK. But when attempted from The Blaze’s sign-in page, if I right-click and tell Autofill “Add rules for this form”, Autofill won’t close when I hit the OK button. Autofill just sits there, forcing me to cancel it. Please fix.

Example of a URL where this happens:


Then scroll to the bottom and click the red Sign In button.