[@lph2005 Participant 15 years, 8 months ago]

Agreed – @johnjamesjacoby – I just did this to a second site and took less than 3 minutes to get it working.

1. Install plugin (https://wordpress.org/extend/plugins/syntaxhighlighter/)
2. Insert add_filter statements around line 112 of the syntaxhighlighter.php file in the plugin directory

Easy!