Hello John,
I have no experience with that, however, in the Google Chrome / chrome-extensions-samples at repository at Github, we can see this "simple" sample of context menu. If you pick the raw "sample.js" of the referred sample and copy it in the WebExtBackground app's event (or if you place it as a background script), certainly we can see a context menu of our WebExtension. You must study that "sample.js" code, John, as well the related API documentation.
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