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от Пользователь Firefox 248d75 Ноя. 8, 2019 · permalink

Thank you! For MAC Thunderbird I had to download version 1.2.1 (from the main page but you have to scroll down, it's not the highest version) on 11/7/19 - then add it manually from my finder. I am not expert, don't know if there was a better way but am adding this information for similarly computer-challenged folks. The add-on does just what I hoped, allows me to rearrange the too-many gmail folders I have...