@gl can you take a look at the DevTools test added here?
@nika @mconley I used this.browsingContext.docShell.isContent here to rule out chrome-privileged documents. Do you know if there is better way to check if the current document is chrome-privileged or not?
Differential Revision: https://phabricator.services.mozilla.com/D51320
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extra : moz-landing-system : lando