RTCP FIR Request Problem

I want to notify the browser to refresh I frame by send FIR request through RTCP,I use PliPacerHandler module to send this request,but it not works for me,the browser just don’t send I frame to licode when it receive this request,How can I force browser to generate I frame and send it to licode?

which is the browser you’re talking about?

Thanks for the reply.
I am using google chrome.Do you have any suggestion to force browser to refresh I frame by using licode?