To install the MetaMask extension, follow these steps:
Open your web browser (e.g., Chrome, Firefox).
Go to the official MetaMask website or search for "MetaMask extension" in your browser's extension store.
Click on the "Add to Chrome" (or equivalent) button.
Follow the prompts to add the extension to your browser.
Once installed, you'll see the MetaMask fox icon in the toolbar of your browser.