Firefox 4b2 and Windows 7, multiple tabs shows up as windows in OS-taskbar

I have been using Firefox on my Windows 7 based computer (Ultimate x64) and I didn't experience this when using v3.6 and earlier versions. But ever since I updated to v4 (beta 1 and now beta 2), I have noticed that when I have multiple tabs open in Firefox, it shows up as Windows in Windows 7-taskbar... If I hover the pointer over to, and place it above the Firefox Icon (or click it), a LOOOOOooonng list shows up with each tab.. But that wasn't the case when using v3.6 for example, instead, each window showed up, but the tabs didn't show until I opened the actual Firefox-window, and this is exactly how I would like it to be.. I have been searching with lights and without finding any answer/s, search the settings-tab and other locations where this feature might show up, but I can't seem to find it, Im completely out of ideas and I need your help.
Best regards // Martin Johansson, Sweden
== This happened ==
Every time Firefox opened
== When I updated from v3.6 to v4 Beta 1, and now also with beta 2

You need to change a hidden setting.
Type '''about:config''' into the location bar and press enter.
Accept the warning dialog that appears.
This brings up a list of preferences, in the filter box type '''taskbar'''
Double-click on the preference called '''browser.taskbar.previews.enable''' to change its value to '''false'''

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