User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0 Build ID: 20170125094131 Steps to reproduce: The access to the file system is extremely important for debugging release versions of add-ons or distribute add-ons settings with the test addons. Actual results: The error message (in addition) from users could previously be accompanied by the installation of a test version of add-ons on their browsers with the same addon id and settings. When this extension was completely identical to the behavior when starting the browser (which not provides about:debugging). Now its prevents the need for using signature add-ons. So looking for other ways to debug. Expected results: USE CASE 1 1. The user should be able to provide detailed logs if he gets an error and developer cannot be repeated. 2. A developer wants get full user setting the additions. It is easiest to implement if it's possible to export the settings to the file. USE CASE 2 It is possible to transfer add-on settings between different versions of the add-on or between different user profiles (to set up similar profiles).