Works well to enable ClickOnce Application support in FireFox Rated 5 out of 5 stars

I'm not sure what everyone is so upset about, but it works well for me to enable ClickOnce Application support in FireFox.

Um, no. Rated 1 out of 5 stars

The fact that over 2 million systems still have this installed tells you something.

This user has a previous review of this add-on.

Rated 1 out of 5 stars

Never install this it.

Never install this addon! Rated 1 out of 5 stars

Never install this addon!

Help Rated 3 out of 5 stars

When i am downloading this framework , it show a problem to install it. tell me how can install it.

Works as advertised Rated 5 out of 5 stars

I needed this to use some internal software at work. Using this, together with Stylish and AutoAuth, I don't need to open anything in IE anymore. :)

Rated 4 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."

NOTE: In later editions of Firefox it is only the above key that needs to be deleted, there is no corresponding entry in about:config. Restarting Firefox after deleting the key will no longer display this add-on in add-ons

Goodware Rated 5 out of 5 stars

I'm not a Developer so I don't have a use for this add-on but that doesn't make it useless, Believe it or not there ARE people who use .application files.

P.S. don't whine; at the very least be thankful that Microsoft registered their add-on with Mozilla.

P.P.S. If you want to remove it then Reinstall it through AMO (

Help Please Rated 1 out of 5 stars

OK I need an opinion .. I want to download the newest version of Firefox but it says I will have the Microsoft .net framework assistant disabled because the one I have isn't compatible.. DO I NEED to have this update to successfully run Firefox ( I have no clue and NOT ashamed to say so ) HELP Please

Not needed for using Firefox, not harmful either

See here: to remove it. It's simply an extension for launching a specific type of .NET Framework Application called a "ClickOnce application". If you don't know what one is, you can either safely ignore it completely or follow the instructions above to uninstall.

Huh? Rated 1 out of 5 stars

Well I always do manual updates. So I hadn't updated for at least 3 weeks. Opened Firefox and it installs. Uninstalled through the add-on manager. Maybe I did download it in an update. Didn't expect a Windows update to include an add-on for Firefox.

I guess it's good for Firefox to be mainstream but it's not IE for a reason, a GOOD reason. Lets keep it that way.

Rated 5 out of 5 stars

It's not at all useless if you work with and use Visual Studio.

Much Ado About Nothing Rated 4 out of 5 stars

Seriously, all the fuss that you chicken littles are making over this little Add-on: Windows Update setting changes, patch installs, registry hacks, forum posts, whining, crying, etc.

I've said it before but I think it bears repeating.

* This Add-on helps Firefox launch applications from the browser that were deployed with Microsoft's Click-Once technology (think "kind of like Java applets"), that way you aren't "forced" to use Internet Explorer.

* This Add-on DOES NOT circumvent security

* Technically, this Add-on WAS NOT installed without permission. It was part of a Windows update which, if you received, you gave consent to.

* True, the Add-on cannot be uninstalled through the Add-ons Manager, but it CAN be disabled through it. And for the crybabies, Microsoft provides an update to remove it.

Guess what? There is another extension that was "installed without permission" (so to speak), cannot be removed through the Add-ons manager and also helps apps run from/within the browser. It's called...

Java Quick Starter

But I don't hear anybody b!tching about that one or talking smack about Sun/Oracle. If Microsoft gets your panties all twisted then STOP USING WINDOWS!

Haters gonna hate...

This user has a previous review of this add-on.

ClickOnce forever Rated 1 out of 5 stars

Not needed, big pain to get rid of.

This from Microsoft:

"A key goal of ClickOnce is to provide a trustworthy deployment model for users to be able to download and execute applications from centrally managed servers without requiring administrator privileges on the client machine"

I am the administrator (one and only user) and don't need to circumnavigate admin. privileges via 'ClickOnce'. Many here are probably in the same boat.

Microsoft deliberately built this extension as a "machine-level" application, meaning you (the user) can't uninstall it, even if your the 'administrator'.

.netsp1 supposedly addresses this problem, but I, like many commenting here can't get it update to the fix (at least through Firefox) - catch 22.

I eventually deleted the extension following the suggestion below before manually download the update from MS, so I hope this is the last word, but as a backup I'll use this update (hopefully) to finish off the beast.

As a side note, FF needs to have a better handle on its add-ons or they are going to continue to lose market share. This automatic add-on update at the start of FF needs to go and they need to have an uninstall button for all non-essential extensions. This is my second unwanted extension I couldn't uninstall through the 'add-on' panel and I'm not happy.

Rated 5 out of 5 stars

There are many websites on the internet with applications that need this to run. It's fine.

A solution to reinstallation (?) Rated 1 out of 5 stars

I hate this addon and have also been plagued by it being reinstalled by MS.
I *think* I found the solution though....

1) Start with this:
2) Use Method 2... BUT ... only do steps 1 and 2.
Yes, the Preference isn't there, but you can create a new one (right click anywhere in the preferences wiindow... and... New) and then Reset it as instructed.

The addon is gone from my addons list... and... I think MS will still see it's installed because I haven't messed with their folder.

I'll repost if it comes back.
.... Rick

I don't understand Rated 2 out of 5 stars

I don't understand what this does and why it seems to be desperately needed on my system, it updates every time I run Firefox so, any clarification would be appreciated, especially as to why it updates to version 0.0.0

Update .NET 3.5

Hi Kenpei,
The 0.0.0 version shipped as part of the per-user update (see here: ) but I'm unsure why it's happening every time you start FF. This is not the same as this copy of the extension, which is only the same in name to the original.

If you do not run ClickOnce .applications on your machine, I suggest just following the instructions you can find on the web (or on the reviews for THIS extension) to remove it... example: .

Rated 2 out of 5 stars

It's pretty sad that Microsoft still makes junk like this (just like the Bing Bar). I mean this maybe useful for people who use ClickOnce or I just think its plain wrong for you guys to just install without any permission to the user. If people want to use ClickOnce then they will download it themselves. This gets installed when you use .net framework (i think).
Anyways, for the people who strongly dislike this, you can uninstall it, using the directions provided by Microsoft (note, use Method 2):

Hi NightDrift,
I'd just like to clarify a few things. First off, the issue you're describing was true in .NET 3.5 SP1, shipped years ago, and was fixed via a patch and on Windows Update after it became known. It has not been true for any version of the extension that supported FireFox 3.0 or later (1.1+ I believe, this is 1.3.1). This extension is the work of a single person at Microsoft, who dearly loves both ClickOnce and WPF Browser Applications (partial-trust ClickOnce apps). No version of .NET includes this extension. Nothing stops you from uninstalling it. There are many customers who use .applications, and out of care for these customers we continue to keep supporting new versions of FireFox. While I understand it may be fun or easy to poke fun at Microsoft, it's not valid to say that this is spyware, forcibly put on people's machines, useless, etcetera.

great support Rated 4 out of 5 stars

this is really great idea. i feel really happy to get help from this add on its really best firefox tools

Rated 5 out of 5 stars

Somebody knows whe it will be awaiable wth firefox ? plss

This review is for a previous version of the add-on (  This user has 2 previous reviews of this add-on.

Rated 5 out of 5 stars

Use with Update FF 4.0.1
Works a treat for me...

This review is for a previous version of the add-on (  This user has a previous review of this add-on.