The standard Firefox download manager does not provide many information or options when downloading files. That can be a problem for some users who use the standard download manager and not an add-on or third party download manager for their Internet downloads.
The download manager extension dmextension replaces the standard download manager with an advanced version that provides additional functionality and information to the user.
The download manager window will display relevant information after installation of the add-on. This includes the source url, local download path and date the download was initiated.

The download manager window now contains buttons to access functions that have only been available by right-clicking the files listed in the window. Buttons are available to pause, retry or delete a download or to open the containing folder.
Another interesting feature of dmextension is the ability to change the location of the download manager. It is possible to open the download manager in a separate window or in the sidebar or a tab.
The options offer additional features like the ability to automatically launch downloads after they have been completed, showing alerts when all downloads have been finished, to automatically remove downloads from the list or remove buttons from the advanced download manager’s interface.
Dmextension is available for all Firefox 3.x versions. It can be downloaded from the Mozdev website.
Related Articles:
DownThemAll, Built-In Firefox Download ManagerDownload Manager Tweak Improves Firefox’s Downloading Capabilities
Firefox Default Manager 2.2 Extension
Microsoft Download Manager
Flashget File Download Manager
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Very nice addons for firefox..
It is like IDM software….
This is really a good plugin for Firefox. This is something I can regularly use.
My choices are Custom Download Manager (which lets me put downloads in a tab, rather than a floating window); this lets me monitor downloads by viewing the tab text), and Download Panel (which shows information about the currently selected download at the bottom of the tab window). Down Them All does multi-segment downloads (great for speeding things up), will automatically retry failed downloads, and lets me pause/resume/queue downloads. Might try DMExtension if it would do everything the first two do, in one, smaller extension.