[Bug 1628014] Re: WebExtension fails to install only on ubuntu packaged firefox

[paulgreg]

Same bug when trying to install my 2 extensions in Firefox 49 on Ubuntu 16.04.1 : 
- https://addons.mozilla.org/en-US/firefox/addon/rsstodolist/
- https://addons.mozilla.org/en-US/firefox/addon/uniquepasswordbuilder-addon/

Loading extension from debug page works.
Installing extensions on Firefox Developer Edition (https://www.mozilla.org/fr/firefox/developer/) works.

Here the console trace when trying to install one of those extension :

************************
A coding exception was thrown in a Promise rejection callback.
See https://developer.mozilla.org/Mozilla/JavaScript_code_modules/Promise.jsm/Promise

Full message: TypeError:  is not iterable
Full stack: AddonInstall.prototype.onStopRequest/<@resource://gre/modules/addons/XPIProvider.jsm:5974:1
Handler.prototype.process at resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:940:21
this.PromiseWalker.walkerLoop at resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:816:7
this.PromiseWalker.scheduleWalkerLoop/<@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:750:11

*************************
1476609586196   addons.xpi-utils        WARN    Error: XPI database modified after shutdown began (resource://gre/modules/addons/XPIProvider.jsm -> resource://gre/modules/addons/XPIProviderUtils.js:458:17) JS Stack trace: this.XPIDatabase.saveChanges at XPIProviderUtils.js:458:17 < this.XPIDatabase.updateActiveAddons at XPIProviderUtils.js:1441:9 < this.XPIProvider.shutdown at XPIProvider.jsm:2854:7 < _startProvider/AMProviderShutdown/<@AddonManager.jsm:802:21 < Promise at Promise-backend.js:388:5 < _startProvider/AMProviderShutdown at AddonManager.jsm:800:16 < Barrier/this.client.addBlocker/promise</trigger at AsyncShutdown.jsm:720:23 < Barrier.prototype<._wait at AsyncShutdown.jsm:867:7 < Barrier.prototype<.wait at AsyncShutdown.jsm:851:28 < AddonManagerInternal.shutdownManager<@AddonManager.jsm:1199:15

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Title:
  WebExtension fails to install only on ubuntu packaged firefox

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