When adding MetaMask to your browser, you may ask why you'd have to approve an extension to “read and change all your data on the websites you visit” . Get ready, the answer is a bit technical:
To allow dapps (decentralized applications) to access the blockchain, MetaMask must inject a Web3 JavaScript object into each page. The JavaScript object does not modify the website ; it simply allows dapps to access the network. For a more complete explanation, click here .
If you're not yet convinced, you can simulate using MetaMask in an isolated environment by running it in sandbox mode and creating a separate browser profile . This will allow you to familiarize yourself with MetaMask and Web3 using a separate web identity.
That said, we want to remind you that MetaMask allows you to browse the internet safely. Welcome, you've joined the MetaMask community, which has over 30 million users worldwide!