So far it appears that the only mode supported is "spanning" as described here: https://developer.chrome.com/extensions/manifest/incognito#spanning "not_allowed" is not supported..
Andym, Screenshots would like to be able to use 'spanning eventually. Should i file a separate bug or simply update the title here?
I don't think we have a bigger private browsing bug yet. I would file another bug make it a tracker and block this particular part of the API on that bug... and then file a request for spanning as well :)
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