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There is an error on squidguard_log.php
This function needs to be changed

function squidguard_prepfor_JS($cont) {
        # replace for JS
        $cont = str_replace("\n", "\\n", $cont);
        $cont = str_replace("\r", "\\r", $cont);
        $cont = str_replace("\t", "\\t", $cont);
        $cont = str_replace("\"", "\'",  $cont);
        $cont = str_replace("'", "\'",  $cont);
        return $cont;
}

The $cont = str_replace("'", "'", $cont); needs to be before the $cont = str_replace(""", "'", $cont);
Because if the replace of ' to \' before the " to \' will cause a ' to be changed to \\' and will generate an html with ' inside ' without escape.
This causes to config files with ' to not be displayed when we change the view to show the config file