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Any idea when/if this add-on ever will be e10-compatible please ?

EDIT : Thanks a lot for that insightful answer !

Это отзыв для предыдущей версии этого дополнения (2.8.2). 

Actually this addon is 100% compatible with e10s, but Firefox devs have broken dom-storage2-changed notifications in e10s mode and refuse to fix it - https://bugzilla.mozilla.org/show_bug.cgi?id=1130859

Thus when e10s will be forced on, it will be impossible to monitor local storage neither by this extension nor by Self Destructing Cookies nor by any.