Type filter:your_filter_function to add a custom filter condition. You can add a comma separated list with JSON encoded values to be passed to the filter by appending :1,2,3,"variable","var". The filter function should return true or false.
Weight:
(higher weight is selected over lower weight conditions)
The configuration is stored in CTRL->theme_dir('', 'critical-css') . '' . htmlentities($file, ENT_COMPAT, 'utf-8')); ?> and is editable via FTP.
You can append or prepend relative links to CSS files using @append and @prepend, e.g. ../../style.css. Use @matchType (any or all) to match any or all condtions.