Hello,
We’re the developers of the SavvyConnect Addon:
https://addons.mozilla.org/en-US/firefox/addon/savvyconnect/?src=ss
We would like to request that you change the status of the SavvyConnect add-on to allow side-loading. Our users’ add-ons are being disabled after upgrading to Firefox 43, and this is causing significant impact to our business. We used to install our add-on via a custom installer, but recently switched to using the Mozilla add-on store. We have been researching this issue, and closely monitoring various forums to see if other add-on providers are experiencing something similar. We found this google groups post that indicates Mozilla has enabled side-loading for at least one other add-on where users are experiencing a similar issue.
https://groups.google.com/forum/#!topic/mozilla.addons.user-experience/n0r6tXbIYx0
That post references a bugzilla report, which seems to admit this is a bug, which has been addressed, but the fix will not be in place for quite a while:
https://bugzilla.mozilla.org/show_bug.cgi?id=1233459
Our belief is that if side-loading permission is enabled for our addon, users who originally side-loaded the addon will continue to have a normal experience after upgrading to Firefox 43.
We will incur significant business impact if we were to wait for this fix. We appreciate your prompt attention to this request.
Thank you, and happy holidays!