But that’s not the only changes that Firefox 3 users need to get used to when it comes to the new add-on manager. Users who take a closer look at the information listed under extensions will notice that there are only buttons to open an add-on’s options, and to enable or disable it.

On a personal note, the whole new add-on listing feels hard to read and impractical to me, but that is not the point of this article. So, how are add-ons uninstalled in Firefox 4? Let us look at a closeup:

Do you see it? That little x next to the date of one of the add-ons listed in the about:addons menu? That’s how you uninstall add-ons. A tooltip appears if you move the mouse cursor over the x.

A click on the x shrinks the size of the row, and displays options to restart the browser and to undo the removal. The information is easy to miss among all the other links and colors in the manager.

Some add-ons can still not be uninstalled directly from within the add-ons manager. That’s for instance true for add-ons that are added during third party software installations. Especially security software “like” to add extensions to the browser that way.

That’s something the developers should prioritize if you ask me. Why have they made the decision to place that tiny x there for the uninstall functionality? I do not know, but there are other means that appear to make more sense, like adding another button next to Options and Disable, or making use of the space above the two existing buttons.

Have you played around with the new Firefox 4 add-on manager? Let me know what you think of it in the comments.

The Firefox Extension Guru posted a walkthrough on how to remove the Microsoft .Net Framework Assistant. It basically comes down to the following steps (it might be a good idea to backup all data before proceeding).

• Make sure Firefox is closed.
• Go to C:\WINDOWS\Microsoft.NET\Framework\v3.5\Windows Presentation Foundation\DotNetAssistantExtension in Windows Explorer and delete everything in that folder but keep the folder name.
• Start Firefox. The add-on should not be in the list anymore.
• Type about:config in the Firefox address bar.
• Filter for the entry general.useragent.extra.microsoftdotnet
• Right-click that entry and select Reset

The process is apparently a bit more complicated for Firefox 3.1 beta versions as the Microsoft .Net Framework Assistant is not yet compatible with that version of Firefox and thus not completely installed.