It's hardly the only multifeatured download enhancement add-on in Firefox's deep add-ons catalog, but DownThemAll is one of the best. It just got better with an upgrade to version 2 that supports Firefox 4, can customize download speed limits, and sniffs out media including support for HTML5.
While support for Firefox 4 was essential to the add-on's continued life, the granular controls over download speeds are a welcome surprise. You can now set different maximum download speeds by individual download, by server, or as a global preference. Separately, you can also set download limits by server.
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