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As part of Windows Update, which we're all told we must use etc etc, Microsoft quietly rolled out an 'enhancement' to Firefox, relating to the .NET framework, which allows the browser to quietly install downloaded programs from a web-page without the user's permission (or knowledge).

This is not considered a good thing, from a security standpoint, and indeed was one of the drivers for people migrating away from IE to Firefox. It seems a little... strange that Microsoft would, as part of Windows Update, update software that isn't even theirs, odder still that they wouldn't explicitly mention it up front, and terrible that they make it so hard to uninstall (but disabling it is relatively straightforward).

Now, this issue blew up last week - it may be that things have been resolved in the 2nd Tuesday of the Month update that we should have picked up yesterday, and is whirring in the background as I type this, but in case it's not...

From the Tools menu in Firefox, select 'Add ons':
Firefox Tools Menu

This brings up the Add ons window, which has four modes - here it's showing Themes:
Firefox Add Ons Window

Select the jigsaw-piece icon to view installed Extensions:
Installed Extensions

Note that in the pic above, my Web Developer Extension has both a 'Disable' and an 'Uninstall' option. It should be relatively easy to guess what effect pressing one of those buttons might have...

However, when we look at the options for Microsoft's .NET Assistant...
Unable to Uninstall the Microsoft .NET Assistant
...we see that the 'Uninstall' option is ghosted, and unavailable. However, you can at least disable it (this will require you to then restart Firefox for the change to take effect).

Now, Microsoft have a support article on how to completely remove the .NET assistant from Firefox here. I have to say, it doesn't seem to be the most straightforward of matters, so for the time being I'm leaving it Disabled, rather than attempting to uninstall it.

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