The calendar visibility toggle (ìnput.calendar-displayed`) in the calendar list has a tooltip to indicate what will happen when you click on it. However, the tooltip is still provided on the `tooltiptext` attribute while the actual markup around it was converted to HTML. In order for a tooltip to be shown in HTML the tooltip contents should be set on the `title` attribute. I think to fix this essentially all the hits for `tooltiptext` in https://searchfox.org/comm-central/rev/cb87058b16e77e1131b7dad22580a42701e1ed59/calendar/base/content/calendar-management.js#243 need to be updated to instead set the title.
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The calendar visibility toggle (`input.calendar-displayed`) in the calendar list has a tooltip to indicate what will happen when you click on it. However, the tooltip is still provided on the `tooltiptext` attribute while the actual markup around it was converted to HTML. In order for a tooltip to be shown in HTML the tooltip contents should be set on the `title` attribute. I think to fix this essentially all the hits for `tooltiptext` in https://searchfox.org/comm-central/rev/cb87058b16e77e1131b7dad22580a42701e1ed59/calendar/base/content/calendar-management.js#243 need to be updated to instead set the title.