Tip Details Add a Related Tip

Rate as: Positive Negative

Removing the .NET Framework Assistant Firefox Add-on

As part of the Microsoft .NET Framework 3.5 Service Pack 1 update, Microsoft pulled a real a-hole move and installed an add-on to Firefox without asking permission or letting you know this was happening. Even worse, the add-on is a huge potential security hole. It let's install .NET apps with a single click. This can lead to software being unknowningly installed on your computer. Very bad. And it gets worse.

To rub salt in the wounds, Microsoft installs the add-on in such a way that it can't be removed from the Firefox Add-Ons interface in the browser. You can go there and see the add-on installed, but the uninstall button will be disabled. A serious a-hole move.

So if you want to get rid of this security hole, you have to remove the add-on by performing a registry edit and a bunch of other steps. It's a pain, but you really should get rid of this thing. Here are the steps:

1 - Run the registry editor (Start -> Run -> regedit).

2 - In the left panel, go to HKEY_LOCAL_MACHINE + SOFTWARE + Mozilla + Firefox + Extensions or HKEY_LOCAL_MACHINE + SOFTWARE + Wow6432Node + Mozilla + Firefox + Extensions. The path that's available will depend on your Windows install type.

3 - In the right-hand pane, right-click on the value called {20a82645-c095-46ed-80e3-08825760534b} and Delete it.

4 - Close regedit.

5 - In Firefox type about:config in the address bar.

6 - Find the general.useragent.extra.microsoftdotnet entry in the configuration, right-click on it and select Reset. setting.

7 - Restart Firefox.

8 - Open a Windows Explorer window and go to the %SYSTEMDRIVE%\Windows\Microsoft.NET\Framework\v3.5\Windows Presentation Foundation folder.

9 - Delete the entire DotNetAssistantExtension folder.

This should get rid of the .NET Framework Assistant Firefox add-on. Microsoft may fix this so that the add-on can be deleted directly in Firefox without having to take all these steps. So it's worth checking in Firefox first. Just go to Tools > Add-ons and select the .NET add-on. If the uninstall button is not disabled you can skip all the steps above and just delete it by pushing the button.
Rating: 100% positive, 2 total Votes
Categories: Microsoft Firefox add-ons regedit
Added: on Jun 01, 2009 at 10:48 am
Added By: an anonymous user
Searches: add-on firefox microsoft .net regedit

Comments on this Tip

Add a Comment
I've uninstalled this and Firefox seems to be running faster since I uninstalled it.

~Midna
– Added by an anonymous user on Jul 21, 2009 at 4:42 am
Your Comment:
(how to format)
Rate This Tip:

Verify Humanity:
Sorry, we know it's annoying, but please enter the characters shown in the image to the left so that we know you're an actual person and not an evil spammer. Thanks.
       

Related Tips

Automatically expand tiny URLs in Firefox

100% positive, 0 comments
– Tip added by an anonymous user on Dec 30, 2008 at 1:10 pm

Live PageRank in Firefox 3.5

100% positive, 0 comments
– Tip added by an anonymous user on Sep 04, 2009 at 6:19 am

Download videos from Facebook

100% positive, 0 comments
– Tip added by an anonymous user on Nov 18, 2008 at 12:36 pm

Easier Firefox configuration

100% positive, 0 comments
– Tip added by an anonymous user on Jan 28, 2009 at 10:47 am

Upload web images to Photobucket

100% positive, 0 comments
– Tip added by an anonymous user on Dec 20, 2008 at 9:44 am

Tab progress meters in Firefox

Categories: Firefox tabs add-ons
100% positive, 0 comments
– Tip added by an anonymous user on Dec 15, 2008 at 7:21 am

verify rapidshare links

100% positive, 0 comments
– Tip added by an anonymous user on Oct 28, 2008 at 4:34 pm

Get rid of the new tab button in Firefox 3.5

no ratings, 0 comments
– Tip added by an anonymous user on Oct 13, 2009 at 10:10 am

See how web pages look in IE from within Firefox

0% positive, 0 comments
– Tip added by an anonymous user on Mar 15, 2009 at 9:05 am

Save space on your Firefox toolbar

Categories: firefox add-ons browsers
no ratings, 0 comments
– Tip added by an anonymous user on Jan 06, 2009 at 1:59 pm

Select multiple checkboxes in Firefox

no ratings, 0 comments
– Tip added by an anonymous user on Dec 08, 2008 at 5:56 pm

Open Word 2007 documents directly in Firefox

no ratings, 1 comment - last added on Dec 10, 2008 at 6:27 pm
– Tip added by an anonymous user on Dec 05, 2008 at 6:17 am

Bypass rapidshare blocking

no ratings, 0 comments
– Tip added by an anonymous user on Dec 02, 2008 at 2:50 pm

Full screen flash games

Categories: firefox add-ons flash games
0% positive, 0 comments
– Tip added by an anonymous user on Nov 24, 2008 at 10:01 pm

Easier google calendar access

no ratings, 0 comments
– Tip added by an anonymous user on Oct 29, 2008 at 3:52 pm

Customize Thunderbird email folders

100% positive, 0 comments
– Tip added by an anonymous user on Oct 23, 2009 at 7:14 am

Jumping to the last change in an MS Word Doc

100% positive, 0 comments
– Tip added by an anonymous user on Oct 09, 2009 at 8:11 am

Disabling automatic superscripts in Word 2007

100% positive, 0 comments
– Tip added by an anonymous user on Oct 04, 2009 at 5:24 pm

Turn on visual tab previews in Firefox 3.6

no ratings, 0 comments
– Tip added by an anonymous user 2 days, 10 hours ago

Duplicate a tab in Firefox

no ratings, 0 comments
– Tip added by an anonymous user on Oct 22, 2009 at 7:53 am