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"This Add-on could not be installed because it has not been verified"!
Any chance you could fix this?
Thx

That's so weird. The verification happens via thunderbird, so I have nothing to do with it. You could try to download and install manually from here https://github.com/Era-Dorta/Thunderbird-Google-Keep-Tab/releases/download/v0.10.8/Google-Keep-Tab-0.10.8-tb.xpi