Why drag Firefox into this discussion?
Firefox has options for customizing everything, and when it doesn't there's always extensions. That's one of it's best features.
If you don't like "taking a time machine" Firefox's download window can be disabled using "Show the Downloads window when downloading a file" option.
If you don't like "taking a time machine" Firefox's download window can be disabled using "Show the Downloads window when downloading a file" option.