I believe you are looking to identify the traffic and define the policies action based on the browser the traffic initiated from the client . If it is the case, you can do that by creating a custom application to identify the browser and can define the actions . For the custom application you will need to create a signature to look at the user agent strings in the http headers and detect the browser type http://www.useragentstring.com/pages/All/ contains list of User agent strings for your reference. https://live.paloaltonetworks.com/docs/DOC-5028 & https://live.paloaltonetworks.com/docs/DOC-1247 has configuration steps on how to detect the firefox & chrome browsers and block the traffic
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