NOTE: The non-clickable cursor is not an FSB bug.
This is a Firefox error that occurred with the v.59
Once again. Regardless of the version of FSB on which you run your site, the cursor will not work in FF v.59 because it is an FF browser issue.
The following is a temporary fix that will correct this problem. Just place it in your footer section in the settings and save. Delete the cache if you do not see immediate results.