I've done a clean profile test with NS as the only extension.
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Error: uncaught exception: [Exception... "Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.clearUserPref]" nsresult: "0x8000ffff (NS_ERROR_UNEXPECTED)" location: "JS frame :: chrome://dotnetassistant/content/bootstrap.js :: BootStrapDotNetAsssitantExtension :: line 52" data: no]
I have left the .NET assistant extension installed globally in this system - it's the host for visitors who aren't familiar with non-Win systems and I wouldn't like to hobble their use of the web.
Therefore I must opt-out of the .NET Assistant extension whenever I install a new profile. I uninstall - not disable.
All Fx profiles, after uninstallation of the .NET assistant and as soon as NS is installed, report the above error at Fx startup.
I've had zero UI problems as reported by others with the extension installed.
Is the message anything that needs more attention?