please for the exact answer where exactly you need to place these signature certificates (personal QCA+QC CA) in the portable app TB, so the app would also work on a foreign PC when connecting a USB drive, or even through a cloud e.g. terabox.com...? https://www.postsignum.cz/files/navody/thunderbird/index.html
In the classic app TB, we had them automatically installed in the windows PC repository.
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digi signature QCA install