Disable rocket loader by user agent

Hello friend,

If we activate rocket loader for our website the website have no images on chrome browser.
In Firefox its working fine. How to make website working with rocket loader in chrome please?

Second question:
We try to create a rule to disable rocket loader if user agent contain chrome.
Please tell me how i can set: if user agent contain "chrome* → dont use rocket loader.
We already try it by select dropdown: contains… and then we entered Chrome. But rocket loader is not getting disabled. Why?

BR
Tommy