Yes, both MetaMask Extension and Coinbase Extension can be used on mobile devices.

MetaMask Extension is available as a mobile app for both iOS and Android devices. You can download the app from the App Store or Google Play Store and follow the instructions to set up your wallet. Once set up, you can use the app to make transactions on the Ethereum blockchain and view your transaction history.

Coinbase Extension is also available as a mobile app for both iOS and Android devices. You can download the Coinbase app from the App Store or Google Play Store and follow the instructions to set up your account. Once set up, you can use the app to buy, sell, and exchange cryptocurrencies, as well as view your transaction history.

It's important to note that the mobile versions of these extensions may have slightly different features or interfaces than their desktop counterparts. Additionally, you may need to enable certain settings or permissions on your mobile device to use these extensions effectively.