User Agent: Mozilla/5.0 (Windows NT 6.1; rv:50.0) Gecko/20100101 Firefox/50.0 Build ID: 20100101 Steps to reproduce: buildID: 20170702030204 userAgent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0

It also on new profile. { "application": { "name": "Firefox", "osVersion": "Windows_NT 6.3", "version": "56.0a1", "buildID": "20170703030203", "userAgent": "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0", "safeMode": false, "updateChannel": "nightly", "supportURL": "https://support.mozilla.org/1/firefox/56.0a1/WINNT/en/", "numTotalWindows": 1, "numRemoteWindows": 1, "remoteAutoStart": true, "autoStartStatus": 1, "styloBuild": false, "styloDefault": false, "styloResult": false, "keyGoogleFound": true, "keyMozillaFound": true }, "modifiedPreferences": { "browser.cache.disk.filesystem_reported": 1, "browser.cache.frecency_experiment": 1, "browser.cache.disk.smart_size.first_run": false, "browser.cache.disk.capacity": 327680, "browser.places.smartBookmarksVersion": 8, "browser.sessionstore.upgradeBackup.latestBuildID": "20170703030203", "browser.startup.homepage_override.mstone": "56.0a1", "browser.startup.homepage_override.buildID": "20170703030203", 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