Replace this:
// background images
$regex = '/style\s*=\s*(?:".*?\s*\(\s*\'(.*?)\'\s*\).*?")/si';
$html = $this->document->save();
preg_match_all($regex, $html, $matches);
foreach ($matches[1] as $url)
{
$html = str_replace($matches[1], $this->rewrite_url($matches[1]), $html);
}with this:
$html = $this->document->save();
// background images
if ($this->options['apply']['bgr'])
{
$regex = '/style\s*=\s*(?:".*?\s*\(\s*\'(.*?)\'\s*\).*?")/si';
preg_match_all($regex, $html, $matches);
foreach ($matches[1] as $url)
{
$html = str_replace($matches[1], $this->rewrite_url($matches[1]), $html);
}
}