Download Manager Turbo by Kirk

Turbo Download Manager is the first and only full-featured download manager for Firefox. Manage all your downloads inside Firefox without the need for a separate downloader application. Turbo is tightly integrated with Firefox through context menus, toolbar buttons, and key shortcuts.

Features:

Override the default download manager, and get rid of the bottom downloads toolbar.
Access your downloads in a popup window with a single click on the toolbar icon.
Organize your downloads with a fresh and clean table view or list view, and apply custom filters to group your downloads into different categories.
Notifications for downloads.
Preview your docs, images, audios, videos, and zip files right after your download completes.
Initiate batch downloads by entering multiple URLs or URL patterns.

Advanced Features:

Highly customizable task filters let you group downloads by type, date, URL, etc.
Batch descriptors help you download a range of URLs with a pattern painlessly.
Naming Mask allows you to name a downloaded file by link text, page title, URL components, date/time, and many more.
Rule System uses programmable rules to automatically rename your downloads and route your files to different folders.

Known Issues:

Turbo currently uses Firefox’s built-in Downloads API, so it does not offer multi-threaded downloading capability and has limited support for pausing and resuming large downloads.
All downloaded files can only be saved under Firefox’s default downloads folder or any of its subdirectories.
The extension may not work properly in incognito mode.
The extension is not for downloading YouTube videos.

How to Use:

Click on the extension icon on the top right corner.
Use the popup to view and manage your downloads.
Right-click links, images, videos, or audio files and select "Download with Turbo " from the context menu.
Use the batch download feature by clicking the "Batch Download" button in the popup.