So, I've split my code into two parts. The background process syncs data with the web service on a timer. The popup shows data directly out of the local storage. There is a bit of an edge case where the popup happens to be open and the sync service just finished. I don't want to ALWAYS repopulate the popup DOM with the updated information; just when it is open. Is it possible to detect if the popup is open from the background service.
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