TinyMCE Disables Spellchecker

Problem: TinyMCE rich-text editor disables the operating system spellchecker when using Firefox or Chrome. Solution: Set the TinyMCE configuration "gecko_spellcheck" to TRUE. tinyMCE.init({ ... gecko_spellcheck : true }); In Drupal, you can override this setting by adding an alter function to a custom module. function MYMODULE_wysiwyg_editor_settings_alter(&$settings, $context) { if ($context['profile']->editor == 'tinymce') { $settings['gecko_spellcheck'] = [...]