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por Bogobogo el Jun. 7, 2016 · enlace permanente

I just installed the modified version again – and it works! TB 45.1.1
The xpi-file is in the zip-file, you have to unpack it and then install it inside Thunderbird....
http://reiba.ch/httpDocs/ADDONS/color_folders-1.1-tb_RB.zip
Thanks to stanislav!