Mozilla for some time now has been working on integrating Firefox menus that open in a separate window natively in the browser. The add-on manager is probably the best example right now. It previously opened up in a separate window that you could control separately from the main Firefox browser window. Soon, Firefox will display preferences in a tab instead of a separate options window, and downloads in a panel in the browser instead of the download manager.
While I had issues testing the browser's in-content preferences, I do not really mind that the add-ons manager is displayed in its own browser tab instead of a separate window. It still gives me the flexibility to open it in its separate window, simply by dragging and dropping the about:addons tab away from the browser window so that it is opened in its own browser window.
Add-ons Manager Dialog Returns is a Firefox extension that enables the browser to open the add-ons manager in its own dialog window instead of a tab. Note that the full add-ons manager is displayed in the tab, so that you have access to extensions, plugins, Greasemonkey scripts or themes from the window.
The author of the Firefox add-on has added several improvements on top of the core functionality that may improve the extension's appeal for some users.
You are probably wondering if there are any negatives about the add-on. There is one, and it may keep a lot of users from using the add-on. There is a visible delay (1-2 seconds on the test PC) before the new add-ons manager window opens. If you do not mind that delay, you find download options on the official Mozilla add-ons repository.
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