Polkadot.js Browser Extension

Free

This method provides a reasonable balance of security and convenience. It involves installing the polkadot.js plugin and using it as a “virtual vault," separate from your browser, to store your private keys. It also allows signing of transactions and similar functionality. It is still running on the same computer you use to connected to the internet with and thus is less secure than using Parity Signer or other air-gapped protocols.