WordPress Speed Up Service | WordPress Website Maintenance Packages Reply To: How to remove line numbers when copying from theme/plugin editor?, by DionDesigns You can turn off CodeMirror by going to your user profile, putting a checkmark in the “disable syntax highlighting when editing code” box, and saving the settings. IMO CodeMirror should have never been added to core. It doesn’t meet the guidelines for inclusion into core, and it seems hypocritical to enhance plugin/theme editing at the same time “the sky will fall if you edit plugins/themes” messages are added. CodeMirror would be a fantastic plugin, though. Reply To: How to remove line numbers when copying from theme/plugin editor?