Firefox/Chrome confusion

CCleaner v 3.08.1475 seems to be confused when it comes to Firefox (/Thunderbird) and Chrome.

When cleaning for Firefox, I get a message telling me to close Chrome.

I first got the message when Thunderbird was running, while Firefox wasn't.

post-53239-0-54598600-1311315740_thumb.png

Please do not include links to another site in your posts.

Thanks.