Description: MetaMask is the original web3 wallet. It allows you to run Ethereum dApps right in your browser without running a full Ethereum node. See below for setup with POA Network.
Nifty Wallet and MetaMask do not function properly when both are activated at the same time as chrome extensions. To use one or the other, right click on the extension icon, go to Manage Extensions, and toggle off/on the application you want to use. All data will be preserved in the wallet for future access.
1) Open Metamask, and select "Custom RPC" from the Network Dropdown.
2) In the "Custom RPC" Settings, add the POA Network details and click Save:
Network Name: POA
New RPC URL: https://core.poanetwork.dev
ChainID: 0x63 (99)
Block Explorer URL: https://blockscout.com/poa/core
Note: MetaMask recently updated the ChainID to be a required field. When you update, you may need to reenter the chain id, and it will be converted to a hexidecimal.
Network Name: POA Sokol Testnet
New RPC URL: https://sokol.poa.network
ChainID: 0x4d (77)
Block Explorer URL: https://blockscout.com/poa/sokol