Not without permission from Mozilla. I'm not a lawyer, but [https://blog.mozilla.org/press/media-library/ this page] states: "If you wish to use one of our logos for any other purpose, including identifying Mozilla as a client or partner or showing compatibility of your product with Firefox you must obtain written permission from Mozilla unless your contemplated use is already allowed by the rules in our [http://www.mozilla.org/foundation/trademarks/policy.html trademark policy]."