RemoteSign is a Chrome extension developed by remote-sign.com that offers a temporary and limited way to access your friend's MetaMask wallet without the need to share private keys. This free add-on falls under the category of Browsers and specifically the subcategory of Add-ons & Tools.

With RemoteSign, you can generate access keys on remote-sign.com using your MetaMask wallet. Each access key is connected to a specific Ethereum address and grants limited access to that wallet. You can then provide the access key(s) to your friend, allowing them to install the RemoteSign extension and use it similarly to MetaMask.

To use RemoteSign, your friend simply enters the access key provided by you. The extension then forwards requests to remote-sign.com, where you can use your MetaMask to approve or deny your friend's requests. This ensures that your friend can perform actions on the Ethereum address associated with the access key, while maintaining the security of your private keys.

Please note that RemoteSign is still under active development and may contain errors. However, it offers a convenient alternative to sharing private keys for temporary access to MetaMask wallets.