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DownThemAll (or just dTa) is a powerful yet easy-to-use Mozilla Firefox extension that adds new advanced download capabilities to your browser.
DownThemAll lets you download all the links or images contained in a webpage and much more: you can refine your downloads by fully customizable criteria to get only what you really want.
DownThemAll is all you can desire from a download manager: it features an advanced accelerator that increases speed up to 400%, it allows you to pause and resume downloads at any time and, last but not least, it's fully integrated into your favorite browser!

The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.

Major new features:

Firefox e10s (multi-process) compatibility
Asynchronous Input/Output (mostly)
Custom file names and file renaming during and after downloads
Advanced queue searching/filtering/sorting, incl by size, status, name, etc.
Metalink4 (RFC) support incl http headers
Finer grained queue management functions
HiDPI (Retina) icons
Improved user interface incl full Australis support
Some new customizable preferences
Better support for third-party tools such as AntiContainer
Many tiny improvements and refinements
Some speed improvements
Better handling of “aggressively” configured cloudflared servers
Restartless add-on and corresponding new code architecture
Some new very advanced power user preferences, e.g. DTA only proxy (available via about:config only)