If a tab is closed before the method responds, the Messenger throws "Could not establish connection"

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Context:

• https://github.com/pixiebrix/pixiebrix-extension/issues/2902#issuecomment-1062658248
• https://github.com/mozilla/webextension-polyfill/issues/365

Refer to the steps in https://github.com/pixiebrix/pixiebrix-extension/issues/2902#issuecomment-1062658248

Possible solution:

• Drop polyfill usage

Drawbacks:

• We don't get native Errors in Firefox (🤷‍♂️)

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This problem is temporarily fixed by https://github.com/pixiebrix/webext-messenger/commit/0d20b5a073b95e2ff21d1add641c7c9c166e77ce but if this issue is resolved:

• https://github.com/mozilla/webextension-polyfill/issues/384

before this one:

• https://github.com/mozilla/webextension-polyfill/issues/365

the problem will return.

I think the best way to handle this is to drop the polyfill so we don't have to depend on what Mozilla’s schedule and decisions.

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Reopening because of my previous comment