Firefox 4 got some changes compared to Firefox 3.6. In firefox 3.6 when you open a add-on manager dialog box it popups. There is change made to firefox 4 regarding this popup add-on manager window, it opens in a new tab in firefox 4. To say I didn't like this change in firefox 4, I wish I want the dialogue box should open as a popup window.
When you install the Add-ons Manager Dialog for Firefox 4 add-on you no longer can open the add-on manager dialog box in a new tab. The add-on manger dialogue window popups after the installation of this add-on. This add-on is in experimental stage, means it is reviewed by the firefox add-on editor and may have some bugs in it. As per my experience after using it I didn’t find any bugs in it.
Install the add-on here.
Open Add-on Manger dialog window via Tools—> Add-ons or Ctrl+Shift+A.
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