Anṣuf ar Thunderbird n izegrar.

Rnu timahilin neɣ iɣunab nniḍen akken ad terreḍ Thunderbird d ayla-k.

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D ayen ara tawiḍ?

Ddu ad twaliḍ Asmel-neɣ n izegrar izirazen.

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blabla4

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Isem blabla4
D aseqdac si Jan. 31, 2017
Amḍan n izegrar yuttusneflin 0 izegrar
Talemmast n tezmilin n izegrar n uneflay Ur yettwasezmel ara

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Yettwasezmel 4 ɣef 5 n yetran

sɛur blabla4 di Jan. 31, 2017 ·

Without modifying the intall.rdf version 1.6.4 of this addon is still not compatible with the latest Thunderbird, despite it being stated in the version info.
Just replace the <em:id> used with the following: "{3550f703-e582-4d05-9a08-453d09bdfdc6}"
and increase the max version to meet your version.
That way it works like a charm.