All in one Side bar became invisible
Since 5/20/2017 the addon AIOS became invisible, though enabled (even tried to reinstall it). Present FF version 53.03 . It was auto-upgraded AFTER AIOS disappeared.
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AIOS reappeared again after toggling View/toolBars/AIOS a couple of times. Hmm. The puzzle is there still, because I did it before and it did not help... Anyhow, presently the problem is not there except for a minor BUG