metamask-extension

It's not pointing at a contract. Metamask should let you view the data (and it they're working on it[1]), but ultimately if you want to verify the contents of a contract you're deploying you'll have to compile it yourself. I suppose metamask could take the source and compile it for you, but ultimately verifying what a transaction is going to "actually" do seems like a difficult problem that's unlikely to be solved anytime soon. [1] https://github.com/MetaMask/metamask-extension/issues/2847

One of our use cases used factory pattern when creating contract instances. You'd get contract address by subscribing to event from the blockchain. Issue I ran into was that metamask would not get events from the blockchain even though it should. There we're a lot of issues with the feature, some resolved, some still not. Basically this issue: https://github.com/MetaMask/metamask-extension/issues/2393

It's a well known extension with Ethereum users. https://github.com/MetaMask/metamask-extension