As of Jaxx 0.0.15, the Jaxx Ethereum wallet now boasts a Contracts section. These new options are designed to enable you to send to smart contracts.
You can view the Contracts section by selecting the white arrow button below the Send field in your Ethereum wallet. It also expands automatically when you scan or enter a contract address.
Gas Limit: Specify the desired gas limit for this contract. Jaxx will autofill the recommended amount of gas required.
Custom Data: Specify a data string or message.