Hmm … thanks for the followup. When I make this code change on Line 19 as you suggested …
FROM:
define('WPFB_PLUGIN_URI', str_replace(str_replace('\\','/',ABSPATH),get_option('siteurl').'/',WPFB_PLUGIN_ROOT));
TO:
define('WPFB_PLUGIN_URI', plugins_url('/',__FILE__));
… then the WYSIWYG text editor no longer displays on the screen when editing pages or posts. When I switch back to original code the WSYIWYG editor DOES appear as expected.
I tested this in BOTH https and http.