Not something I am familiar with, partly because I try to avoid using Windows. Can you point to any documentation or blog etc about this flaw. This sounds more like a Windows issue than Firefox issue. A plugin is a program separate from Firefox and I presume most on Windows will be installed globally. * [[Use plugins to play audio, video, games and more#w_what-are-plugins]]'''_what-are-plugins''' Quite possibly you are asking about Flash Player, something that is getting less important, and maybe it's protected mode * [[Adobe Flash protected mode in Firefox]] * NPAPI Plugins in Firefox : <br> https://blog.mozilla.org/futurereleases/2015/10/08/npapi-plugins-in-firefox/ It is outside the scope of this forum to discuss Windows issues not directly related to Firefox. However it is probably helpful to some readers of this thread if I point to a couple or articles about account use. * Configuring Windows 7 for a Limited User Account <br> https://technet.microsoft.com/en-us/library/ee623984%28v=ws.10%29.aspx * XP: Types of user accounts <br>https://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/ua_c_account_types.mspx?mfr=true And so I guess also worth mentioning "runas" and '''Firefox's''' Maintenance Service * Runas https://technet.microsoft.com/en-us/library/bb490994.aspx *'''[[What is the Mozilla Maintenance Service?]]'''