I'm developer of a simple "Restore Tab" Addon: https://addons.mozilla.org/en-US/firefox/addon/undoclosetabbutton/ Some days ago, I got the following bug report: https://github.com/M-Reimer/undoclosetab/issues/19 This report is basically about a problem, that my Addon sometimes restores random tabs or even windows. The only reason for this, I can think of, is, that in some situation the session IDs not really match the actual tabs and windows. Something seems to be "mixed up" sometimes. Maybe there can be some case where the IDs are regenerated for some reason? And if this happens, Addons don't receive the "sessions.onChanged" event? Problem is, that this can't be reproduced easily. I also got this issue in the past, but haven't seen it since then.
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