Adding development Substrate accounts to polkadot.js extension

Accounts like Alice, Bob, Ferdie etc are derived from a pre-known development seed. You can find this here: https://polkadot.js.org/docs/keyring/start/suri/#dev-accounts

So the seed is bottom drive obey lake curtain smoke basket hold race lonely fit walk.

Paste bottom drive obey lake curtain smoke basket hold race lonely fit walk as the seed, and set a name and password.

How derivatino works