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This morning I went to a question where the edit tags button was hidden, however I went over it with my cursor, though I didn't click it, it became visible. However even when I moved my cursor off it it still stayed there. And it seems to be the case that all questions I now visit on AskUbuntu have it visible all the time which is strange because normally it stops being visible after I move my cursor away from it.

I do not currently have 10k+ on any other sites in the SE network so cannot check whether or not they are affected.

I am running Ubuntu GNOME 16.04 with GNOME 3.20 and Firefox 47.

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