fix: Firefox Metamask connection issue

[jmrossy]

Fixes https://github.com/hyperlane-xyz/hyperlane-warp-ui-template/issues/149

The problem is due to a very old Metamask bug in Firefox when interacting with DApps using CSP headers (which Dapps should absolutely use for security).

There's a relatively simple workaround I drop into all my DApps which I somehow forgot to setup here.

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