@stevencee if you haven't already I would enable the one-click keyboard shortcuts. Better usability imo. Press 0 or + (repeatedly if desired) to zoom in and then 6 to return immediately to 100%. Far easier than messing around with the icon.
@burtz yeah it is not the best looking extension, agreed lol
i see now nods as far as i know, there is no extension that would provide what you're asking for.
Maybe on github, haven't looked there yet.