Fix broken report bug links and add Firefox + Opera
Fix broken report bug links and add Firefox + Opera

louquillio/webrtc-org,Scintillo/webrtc-org,samdutton/webrtc-org,webrtc/webrtc-org,Scintillo/webrtc-org,samdutton/webrtc-org,louquillio/webrtc-org,Scintillo/webrtc-org,webrtc/webrtc-org,webrtc/webrtc-org,louquillio/webrtc-org