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Norton Identity Safe 2016.5.6.90 Bug
After Norton Identity Safe 2016.5.6.90 was installed everything worked fine for awhile. Then it stopped functioning. First Norton Safe Search disappeared from the toolbar and then I couldn't click the three dots menu. I could only restore it by clicking customize from the Firefox menu and clicking restore defaults. That restored it for the current Firefox session. Upon closing and opening Firefox it stopped functioning again.
Screenshot (nothing works except maybe the safe web part);