Secretly installed when you update .NET Rated 1 out of 5 stars

You can only remove it when you do this:
In Registry Editor:
- Go to
HKEY_LOCAL_MACHINE \ SOFTWARE \ Mozilla \ Firefox \ Extensions
- Delete value {20a82645-c095-46ed-80e3-08825760534b}
In Firefox:
- Go to about:config
- enter microsoftdotnet in Filter
- Right-click general.useragent.extra.microsoftdotnet
- select Reset.
- Restart Firefox.
- In Windows Explorer
- navigate to
c:\Windows\Microsoft.NET\Framework\v3.5\Windows Presentation Foundation
- Delete DotNetAssistantExtension folder

This review is for a previous version of the add-on (1.1).