This script should only be loaded in a browser extension.

[addlistener]

webext-bridge 6.0.1

complaining code

import { sendMessage, onMessage } from "webext-bridge/content-script";

Possibly related to zikaari/crx-bridge#7 ? However no installation of webextension-polyfill or crx-polyfill are found

[zikaari]

You might be importing this in the wrong runtime, for example if this is being run in a script injected by content script - it won't work

[beautyfree]

You might be importing this in the wrong runtime, for example if this is being run in a script injected by content script - it won't work

Faced the same problem. Is there a way to make this work in an injected script?

[beautyfree]

Looks like I managed it.
Now I use webext-bridge/widnow in injected script

and don't forget about it:
https://github.com/zikaari/webext-bridge?tab=readme-ov-file#sendmessagemessageid-string-data-any-destination-string

Note: For security reasons, if you want to receive or send messages to or from window context, one of your extension's content script must call allowWindowMessaging(<namespace: string>) to unlock message routing. Also call setNamespace(<namespace: string>) in those window contexts. Use same namespace string in those two calls, so webext-bridge knows which message belongs to which extension (in case multiple extensions are using webext-bridge in one page)