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I am not using Calendar but I get an error message that a script is nonresponsive; Script: chrome://calendar/content/calendar-base-view.xml:198

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Non-responsive script messages pop-up and block Thunderbird. Most recently, although I am not using Calendar, I got an error message that a script is nonresponsive; Script: chrome://calendar/content/calendar-base-view.xml:198 How do fix the underlying problem?

Non-responsive script messages pop-up and block Thunderbird. Most recently, although I am not using Calendar, I got an error message that a script is nonresponsive; Script: chrome://calendar/content/calendar-base-view.xml:198 How do fix the underlying problem?

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You may not be using the calendar, but is it installed?

Tools|Add-ons|Extensions, locate Lightning and remove it.