[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 09:18:19 EST 2017

There are two different ways to include an addons. Addons in 
app-dir/distribution get just installed in the user profile, while 
addons in app-dir/extensions are working from that place without getting 
installed in the user profile and can only be diabled but not 
uninstalled by the user (this is the way Lightning is bundled on Daily). 
However, you can over-install the latter with any version of the 
respective addon, which is then used in the first place would prevent of 
making use of changes in the distributed addon (which may or may not be 

For Lightning, we decided intentionally to use the distribution folder 
way for versions other then Daily when starting to bundle Lightning to 
allow a for a permanent opt-out with no not-wanted code on your system. 
There is a trade-off regarding respecting the user's decision for a part 
of the TB population and the ease of updating for the remaining part.

Regarding compatible versions, for Daily, simply remove overinstalled 
copies of the addons and you get catered with the up-to-date and 
compatible version.

For beta/esr, remove the mentioned pref if you have problems because you 
uninstalled Lightning before. After doing so and as long as you don't 
install it manually again, updates will happen on TB update 
automatically - apart from that, there exists 

For Google provider, for Daily the above mentioned applies and for esr, 
use amo (or it's successor). For beta would would have to download it 
from the beta builds, if there is no respective verion on amo.

Any change to the existing update behaviour would require changes in the 
AddonManager or XPIProvider code, which I assume will not be accepted 
anymore since legacy addons support is discontinued in FF.

Am 09.12.2017 um 14:24 schrieb Jörg Knobloch:
> On 09/12/2017 13:44, MakeMyDay wrote:
>> Check your prefs for extensions.installedDistroAddon.<extension-id>, 
>> for Lightning, this is:
>> extensions.installedDistroAddon.{e2fda1a4-762b-4020-b5ad-a41df1933103}
>> 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. 
> \o/
> Yay, that did the trick. I'm a little surprised that you can remove 
> distribution add-ons, I thought you can just disable them.
> Thanks for the help, I'll keep the solution in mind.
> Any suggestions how we could alleviate the search for matching add-ons, 
> like Lightning and the Gdata Provider?
> Jörg.

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