Sancus asked me to verify, if the update check for addons will eventually update the addons or not. I created a new profile in TB60 and upgraded that again to TB68 and after the first start I changed `extensions.update.interval` to 20s, restarted and shortly after the addons updated. So it is really just a timing thing. From the user point of view, the first thing we do after upgrading Thunderbird is to check which addons work - and currently we get a list where every single addons (expect lightning) is marked as not compatible. If it is a simple fix, I would suggest to enforce an addon update request while doing the profile upgrade.
Bug 1574183 Comment 6 Edit History
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Sancus asked me to verify, if the update check for addons will eventually update the addons or not. I created a new profile in TB60 and upgraded that again to TB68 and after the first start I changed `extensions.update.interval` to 20s, restarted and shortly after the addons updated. So it is really just a timing thing. From the user point of view, the first thing we do after upgrading Thunderbird is to check which addons work - and currently we get a list where every single addon (expect lightning) is marked as not compatible. If it is a simple fix, I would suggest to enforce an addon update request while doing the profile upgrade.