content_css: This option will enable the content_css.css file found in the wp-content/plugins/ultimate-tinymce/css/ directory. Usage: Checking this option will "tell" the tinymce editor to load it's stylesheet from the alternate location mentioned above. I have already included the default file. This file can be modified (CSS knowledge required). What this allows is for the user to modify the file mentioned above to suit their preferences. There are a few various options a user can modify. Here is one example: Adjust editor default font size: On line one of the content.css file is the following code... body, td, pre {color:#000; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:13px; margin:8px;} The font size can be adjusted by making the following modification (changes in red)... body, td, pre {color:#000; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:16px; margin:8px;} You can also adjust the font, the margin between lines, etc. Note: These adjustments ONLY affect content inside the editor, and NOT what is rendered on the front-end of the website.