
I got this information from Yusuf. Since this is really a important information for Firefox users in Windows I thought of posting it on my blog. First of all I would like to thank Yusuf for sharing this information in MLUG Mailing List.
Microsoft .NET Framework 3.5 service pack update which is installed through Windows Automatic Update Installs “.NET Framework 3.5 Assistant Firefox Extension to Firefox without asking the user anything.
This update is dangerous and there are bad effects of this update to Firefox users on Windows. This update makes Firefox unsecure as Internet Explorer. This extension allows the websites you visit to, Install softwares on your system without asking anything.
If you have .NET Framework installed along with Firefox remove it immediately. You can remove it by going to addons on firefox and click uninstall.
Most user-friendly way to remove this addon:
1. Open Registry Editor (type regedit in the Start menu Search box in
Vista/Windows 7, or in XP’s Run window).
2. Expand the branches to the following key:
- On 32-bit systems: HKEY_LOCAL_MACHINE \ SOFTWARE \ Mozilla \
Firefox \ Extensions
- On x64 systems: HKEY_LOCAL_MACHINE \ SOFTWARE \ Wow6432Node \
Mozilla \ Firefox \ Extensions
3. Delete the value named {20a82645-c095-46ed-80e3-08825760534b} from
the right pane.
4. Close the Registry Editor when you’re done.
5. Open a new Firefox window, and in the address bar, type
about:config and press Enter.
6. Type microsoftdotnet in the Filter field to quickly find the
general.useragent.extra.microsoftdotnet setting.
7. Right-click general.useragent.extra.microsoftdotnet and select
Reset.
8. Restart Firefox.
9. Open Windows Explorer, and navigate to %SYSTEMDRIVE%\Windows
\Microsoft.NET\Framework\v3.5\Windows Presentation Foundation.
10. Delete the DotNetAssistantExtension folder entirely.
11. Open the Add-ons window in Firefox to confirm that the
Microsoft .NET Framework Assistant extension has been removed.