Release 6.4 Please note that QuickFolders is compatible with the latest version of Thunderbird (115.5.1) - if you get a message that says otherwise after updating from earlier versions (e.g. Tb91) or if QuickFolders cannot be enabled with the blue slider, simply remove it and reinstall it via "Find more Add-ons" search box on the Extensions tab of Add-ons Manager. To support QuickFolders, please buy a QuickFolders Pro license here. Or get the new cheaper QuickFolders Standard License. This is the preferred way of funding all the ongoing work and improvements. Read the new comparison chart to see which functions you get depending on your license. You can also donate from here. Improvements Bugfixes Other Improvements