WebRTC provides web calling services by enabling communication between browsers in a P2P fashion. To achieve security and enhance user privacy it is essential to define the level of trust between the various entities involved in WebRTC security architecture. The existing P2P trust models are not directly applicable as the characteristics of browser to browser communication are not taken into account. We, therefore present 'Br2Br' a vector based trust framework for defining trust in WebRTC. The concepts of trust requirement, trust context, trust policy and trust evaluation are proposed to define trust relationships in WebRTC architecture. The framework considers identification, reputation and experience parameters to evaluate the amount of trust, distrust and mistrust. Finally we present set of characteristics and behaviors essential for the evaluation of trust in WebRTC communications