[Maildev] Is there a way to reactivate the Calendar/Lightning distribution extension after installing a beta?

MakeMyDay makemyday at gmx-topmail.de
Sat Dec 9 07:44:27 EST 2017

Check your prefs for extensions.installedDistroAddon.<extension-id>, for 
Lightning, this is:


Iirc, if that pref is set and the respective extension is not in the 
list stored in extensions.xpiState, the installation of an addon is 
prevented in XPIProvider code to prevent a once uninstalled distributed 
addon from being installed again. (Unfortunately, there is not a similar 
mechanism for disabled addons, which make disabled Lightning addon to 
enabled on updates). So removing the pref should bring your Lightning 
back on restart.


Am 09.12.2017 um 12:44 schrieb Jörg Knobloch:
> On 09/12/2017 12:34, Philipp Kewisch wrote:
>> If you install it from the candidate builds, then it will not
>> auto-install with Thunderbird. If you've done this before, then you need
>> to "uninstall" it, which will (hopefully?) re-activate the distribution
>> version of the extension.
>> I don't know if there is a more comfortable way. It should "just work".
> Thanks for the quick reply and sorry about not being precise enough.
> I of course "Remove"(d) the add on in the add-ons manager *hoping* that 
> the distribution extension would show up again as disabled, as I think 
> I've seen before. But that wasn't the case, neither with the 52.x I 
> posted about in September, nor with the beta now. After removing the 
> manually installed add-on there is no trace of Lightning anywhere, so 
> I'm forever stuck with searching for the matching version.
> I believe it used to work better on Daily, but now that I switched to 
> Beta, it's not working as described, and for the ESR either.
> I've searched the preferences to see the opt in/out preference 
> (mail.calendar-integration.opt-out?), that's set to false for me, so I 
> didn't opt out.
> So what developer-level surgery is required to get "just work" to 
> actually work?
> Jörg.

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