The addon needs to be sure the addEventListener("message") work is done each time the web app content reloads, which happens occasionally as it tries to update itself. Right now window.addEventListener is used. See if this works across page refreshes, and if so, only do the addEventListener work once.
this was addressed in bug 646598
Status: NEW → RESOLVED
Last Resolved: 7 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 646598
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