Firefox gives "Warning: contains unauthenticated content" on SSL enabled contribution pages and event registration pages

This warning is related to loading of ckeditor.js - and probably caused by (probably non-encrypted) svc.spellchecker.net/spellcheck/lf/scayt/scayt1.js inside ckeditor.js.

If WYSIWYG Editor in site preferences is set to TinyMCE - the warning goes away. However, if set to TextArea we still get warning.
1. We should not load ckeditor.js at all if preference is NOT ckeditor.
2. We should try to fix the problem for sites where ckeditor is the selected WYSIWYG editor by:

• By loading ckeditor.js "on demand" (only on pages where it's needed)

AND / OR

• confirming that spell-checker call is the culprit and if so seeing whether we can get spellchecker to use HTTPS