Is there a chance that this is has the same cause as bug 1549249 ([master password](https://support.mozilla.org/en-US/kb/add-ons-disabled-or-fail-to-install-firefox#w_master-password))?
Bug 1549078 Comment 99 Edit History
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Is there a chance that this has the same cause as bug 1549249 ([master password](https://support.mozilla.org/en-US/kb/add-ons-disabled-or-fail-to-install-firefox#w_master-password))?