Providing guidance on how to get access to your system backup is well outside the scope of this article. However, if you can access the file system and the MetaMask installation is there, we can guide
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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.
