In order to enable dapps (decentralized applications) to access the blockchain, MetaMask needs to inject a Web3 JavaScript object into each page. By doing so, it will not change the website, but merel
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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 technical:
In order to enable dapps (decentralized applications) to access the blockchain, MetaMask needs to inject a Web3 JavaScript object into each page.
By doing so, it will not change the website, but merely allows it to access the network. For a fuller explanation of this, see here.
If you are still not convinced, a good way to experiment and manage your browser is to sandbox your MetaMask: create a separate browser profile so that MetaMask is only installed there. This will let you get used to MetaMask and Web3 in an environment that's separate from your existing web identity.
That said, MetaMask is safe for browsing. Welcome — you're joining over 30 million MetaMask users all over the world!
