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بواسطة Vako في نوفمبر 10, 2018 · رابط دائم

Add-ons not marked as compatible with Thunderbird 60 by their authors will be disabled.
This can be reverted via preference: extensions.strictCompatibility
So go to Options->Advanced tab->Config.Editor and search for "extensions.strictCompatibility" then change it from True to False by double clicking on it.