Paolo Amadini wrote:

A new about:config preference named "browser.download.useJSTransfer" enables 
the browser and the Downloads Panel to use the Downloads.jsm module instead of 
nsIDownloadManager as the back-end. The browser must be restarted for the preference to 
take effect.

Support for this preference will be available in Nightly today or tomorrow. 
This means that it will be ready for testing in the Aurora channel starting 
from version 25, on August 8th.

In the Firefox 26 release train, nsIDownloadManager will not be used anymore. 
The preference will be removed and there will be no way to revert to the old 
system that caused potential performance issues. We will finally be able to 
remove a lot of front-end code that is complex to maintain and only needed for 
backwards compatibility.
I notice that this preference exists entirely in browser front-end code. So how are other Mozilla products expected to test Downloads.jsm?

--
Warning: May contain traces of nuts.
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