Browser Console Script to Show Latest Add-on Update Dates

addon-update-date.js

var AM = Components.utils.import("resource://gre/modules/AddonManager.jsm");
AM.AddonManager.getAllAddons().then((aAddonsList) => {
  var updatelog = [];
  for (let addon of aAddonsList) {
    if (addon.updateDate && !addon.hidden){
      var strActive = (addon.isActive) ? ' (Enabled)' : ' (Disabled)';
      var dt = addon.updateDate;
      dt.setMinutes(dt.getMinutes() - dt.getTimezoneOffset());
      var strDateTime = dt.toISOString();
      strDateTime = strDateTime.substr(0, strDateTime.indexOf('T')) + ' ' + addon.updateDate.toLocaleTimeString();
      updatelog.push('Updated: ' + strDateTime + '; ' + addon.type.charAt(0).toUpperCase() + addon.type.slice(1) + ': ' + addon.name + '; Version: ' + addon.version + strActive);
    }
  }
  updatelog.sort();
  for (var i=updatelog.length-1; i>=0; i--){
    console.log(updatelog[i]);
  }
});