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A comment on New Firefox download manager appears in UX build.
http://nightly.mozilla.org/
On OS X, I have the stable Firefox.app and bleeding edge Nightly.app installed side-by-side, and never have any problems.
I use Nightly and don't have this feature.
http://nightly.mozilla.org/
On OS X, I have the stable Firefox.app and bleeding edge Nightly.app installed side-by-side, and never have any problems.