I have managed to reproduce the issue using Fx 67.0a1 buildID: 20190204092937. The issue is verified fixed using Fx 66.0b7 and latest Fx 67.0a1 (buildID: 20190212195904). After unchecking the "Always use private browsing mode" the user receives the prompt to restart the browser.
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I have managed to reproduce the issue using Fx 67.0a1 buildID: 20190204092937. The issue is verified fixed using Fx 66.0b7 and latest Fx 67.0a1 (buildID: 20190212195904) on macOS 10.14, Ubuntu 16.04 and Windows 10. After unchecking the "Always use private browsing mode" the user receives the prompt to restart the browser.
I have managed to reproduce the issue using Fx 67.0a1 buildID: 20190204092937. The issue is verified fixed using latest Fx 67.0a1 (buildID: 20190212195904) on macOS 10.14, Ubuntu 16.04 and Windows 10. After unchecking the "Always use private browsing mode" the user receives the prompt to restart the browser.