plug-and-klay is the "DEPLOY & RUN TRANSACTIONS" plugin of Klaytn which is EVM based global public blockchain project.
As the official Klaytn DevTools partner, OZYS provides this plugin as well as Klaytnscope which is the official block explorer of the Klaytn chain.
Klaytn has its browser plugin "Kaikas"( similar to Metamask ). and Klaytn provides fee-delegated transaction types unlike Ethereum (transaction sender and gas-fee payer are different).
This plugin supports the above features and Klaytn's own network as native (mainnet Cypress 8217, testnet Baobab 1001).