[Jaxx ➡ MEW] Access your Jaxx account on MyEtherWallet
You can use both MyEtherWallet and Jaxx at the same time; both are client side wallets that simply allow you to access your ETH on the blockchain. There is no need to "import" or "sweep" your ETH from your Jaxx to a new wallet on MyEtherWallet.
Instead, use your Jaxx Mnemonic phrase (12 word phrase) on https://vintage.myetherwallet.com/#send-transaction to unlock your wallet, access the different addresses, and access any tokens or ETH or ETC that were sent to any of your Jaxx addresses.
In order to see your ETC and interact with the ETC chain, you must first be on an ETC node. Select "ETC (Epool.io)" in the node switcher in the upper right corner of https://vintage.myetherwallet.com/.
When you want to see your ETH and send ETH or Tokens, you simply change the node switcher back to an "ETH" node.