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According to https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/this#global_context, 'this' is undefined at top-level when the script is being loaded as module. And this could actually be observed while trying to use email-addresses in a Thunderbird WebExtension:
Uncaught TypeError: global is undefined
moz-extension://5efae89a-4ceb-4bb0-8179-8e3d26b9dee9/node_modules/email-addresses/lib/email-addresses.js:1095
moz-extension://5efae89a-4ceb-4bb0-8179-8e3d26b9dee9/node_modules/email-addresses/lib/email-addresses.js:1098