Here are my findings: I have managed to reproduce this issue while using Avast Internet Security on Windows 10 64bit and Windows 7 32bit with the following Fx versions: Fx 69.0a1 (BuildId:20190530214830) Fx 68.0b6 (BuildId:20190529145824) Fx 67.0 (BuildId:20190516215225) Fx 60.7.0 esr ( BuildId:20190514153425) Fx 67.0.1 (BuildId:20190529130856) Reproducible Steps: 1. Launch Firefox. 2. Create a master password. 3. Add a certificate group policy to install wscert.der 4. Restart Firefox. This seems to be a regression : https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=9728b79f2ff41f879452ab78e565896f3de431b8&tochange=6eb370cb386c62e17f1a58bb0cc7d9e788587f83 Possible caused by Bug 1506734
Bug 1553672 Comment 8 Edit History
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Here are my findings: I have managed to reproduce this issue while using AVG Internet Security on Windows 10 64bit and Windows 7 32bit with the following Fx versions: Fx 69.0a1 (BuildId:20190530214830) Fx 68.0b6 (BuildId:20190529145824) Fx 67.0 (BuildId:20190516215225) Fx 60.7.0 esr ( BuildId:20190514153425) Fx 67.0.1 (BuildId:20190529130856) Reproducible Steps: 1. Launch Firefox. 2. Create a master password. 3. Add a certificate group policy to install wscert.der 4. Restart Firefox. This seems to be a regression : https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=9728b79f2ff41f879452ab78e565896f3de431b8&tochange=6eb370cb386c62e17f1a58bb0cc7d9e788587f83 Possible caused by Bug 1506734