Just updated Firefox to the newest version, 15.0. Now I can't post comments from FCKeditor enabled fields, they are passed as empty and trigger "The field comment is required" error.
"Switch to simple text entry" is also missing. Other parts of editor do load (all the formatting buttons etc).
Firefox error console says:
Error: NotFoundError: Node was not found
Source File: http://www.mysite.com/sites/all/modules/fckeditor/fckeditor/editor/js/fc...
Updated to the newest release of FCKEditor (2.6.8) without any improvement.
Using Drupal 6.25.